What would be the best way to create a wrestling federation in the game then in your opinion? And do you know how many years promotion can go for before it stops?
I actually don't know the upper limit on how long Fire Promoter can run, I haven't taken it beyond, I think, seven years. It's at least that far, though.
But for setting up Fire Promoter and running it, it's best to understand it on its own terms and how it was meant to run. Knowing that it's a tycoon game, we can understand that it's not as much about storytelling or even booking as it's about running a successful wrestling company and overtaking all of the other wrestling companies. In fact, I wouldn't even call them companies in the sense that pro wrestling has companies/federations/organizations. It's actually more like you're running a wrestling team, an mma gym, or a sumo stable. Then your team will have factions within it.
I think the reason it's set up this way is because, in Fire Promoter, it's take for granted that everything is a shoot and, so, things are organized in a way that would make more sense in shoot sports. I honestly don't know a whole lot about how Japanese fans view wrestling culture, but maybe this is kinda how promotions are viewed there or were viewed there. It strikes me as a very sumo-influenced sort of perspective.
Anyway, so the best way to approach setting up your teams/companies is to understand the goals of the mode.
Goals of Fire Promoter in No Particular Order:
1.) Become the most popular promotion
2.) Attain the most title belts
3.) Make the most money
Pursuant to these goals, you'll also eventually need to have the best gym and the best wrestlers, the most wrestlers, put on the best matches, so on and so on, but those are all things that are secondary. They're not the goal, they're just a means of getting to that goal.
So setting up the rosters, I've always looked at how the game was set up for the defaults. I've always went with 16 promotions (plus the players' promotion) so that's the main thing my advice is geared towards here. You've got five levels of promotions and they each have set amounts of wrestlers assigned to them by default. Combined, these rosters will total 126 wrestlers that need to be assigned to promotions. Then you'll want a free agent talent pool as well. I don't have exact numbers on the free agent pool, it can be as big or as shallow as you want, pretty much. I don't believe there's a minimum, but that could be wrong. It's not a problem I've ever explored.
Regardless, your promotions are gonna end up looking like this
One Level 5 Promotion with 16 wrestlers
One Level 4 Promotion with 14 wrestlers
Two Level 3 Promotions with 11 wrestlers
Two Level 3 Promotions with 10 wrestlers
Four Level 2 Promotions with 6 wrestlers
Four Level 1 Promotions with 4 wrestlers
One Player Promotion with 6 wrestlers
You can deviate from this and give the rosters more or fewer wrestlers than the default rosters suggest, but the AI...is kinda rudimentary and doesn't really know how to handle really big rosters so be mindful of that.
You'll also assign companies their region (America, Japan, Latin America, or Europe, in that order) and wrestling style, but those are mostly pretty self-explanatory and intuitive so I won't talk about it much. Regarding styles, I will note that "Freestyle" is basically MMA and "Stoic" is, like, '80s UWF-style shoot wrestling. I don't know why those, specifically, terms were used in Fire Promoter. Especially when "Gruesome" has been used for MMA in the series for as long as I can remember, but...whatever. Everything else should be clear as far as styles and regions go.
Your promotion, regardless to any efforts on your own part will always start along very similar lines. Your wrestlers will begin the game with your promotion's selected wrestling style and no matter how you finagle their popularity according to the calculator, they'll always start along the same lines.
You will, invariably, begin with
One wrestler with B Popularity in your home region
Three wrestlers with C Popularity in your home region
Two wrestlers with D Popularity in your home region
I really haven't messed around with trying to get those popularities to assign to specific people, but I suspect the assignment goes according to their place in the overall wrestler order. Like, this edit was made before this one so it, default, gets this popularity.
All of the other edits in the save begin with whatever popularity they should have according to Avenger's calculator. I've had a few that were higher or lower in a specific region for reasons I can't quiet explain which makes me think there's a missing piece to the puzzle. Maybe their weight or style factors in? Maybe the point threshold is a little off? Maybe I missed something when making the edits. I dunno. Regardless, Avenger's calculator gets you generally very, very close.
SO! With all this in mind, how would I suggest setting up your promotions. I'm gonna assume you want to do real world stuff. Most people do. I mean, for me, I pretty much just run original edits and that allows me freedom to just design things to make sense and fit within Fire Promoter if I want to. But if you wanted to do real world wrestlers primarily...
Well, real world stuff is weird because it's contrary to how the mode views pro wrestling. Wrestling doesn't really have, like, gyms and teams in the way MMA or boxing or other combat sports do. Companies aren't just a stable of wrestlers that different promoters book in tournaments, exhibitions, and fight cards. That's what the mode assumes is the case, though.
So maybe you'd be best off setting up your Fire Promoter rosters with different stables/gyms in mind. Hart Dungeon, NXT, OVW, Chikara Wrestle Factory, Power Plant, New Japan Dojo, stuff like that. That could, honestly, give you a really unique, weird mix of rostermates and a wilder, more diverse cast of opposing companies than just, say, trying to force a modern view of the American wrestling scene to fit into a mode that wasn't designed for it.
Of course, armed with this knowledge and after a little messing around, maybe you'll think of an even better way to do it or something that would be more fun for you.