Hi Henry,
welcome to FISD!
It's a bit more difficult for taller people to find a reasonably good-fitting suit of armor. However, it's not impossible.
Good luck in your journey!
As a first step, you would need to apply for 501st TK status. Look here:
Then take a look here at the checklist; a few pictures are still missing. You also have to apply for Expert Infantary first. Then you can submit a Centurion request.
This Saturday (7th of march) at 16:30 GMT @Morgi and I (maybe others too) will be in the Discord video chat. Please join us to talk about Star Wars, Stormtroopers and whatever else is on your mind