I haven't owned a Bronco in the chassis sense, but from my buddy's experience ('92)...You will need a suspension lift (might as well go 4"), coupled with some sort of body lift (might as well get a 3"). Or 6" suspension, I think, without the body lift, but you'll need to probably mod your steering a bit. You shouldn't need to do any steering mods with the previous scenario (except dropped pitman arm). From there, well it depends on what you get for a Bronco, engine, etc, also how much moola you have. Regearing the diffs would be nice, with maybe a locker (but not necessary). Best thing is to get out there and see what others, that are wheeling where you'll be, are running for mods. There is an infinite amount of things that can be done, depends on what exactly you want and what sort of wheeling you do. I could go on, but I think others ,more Bronco experienced, will chime in with better chassis related info.
Good luck, PJL