@Saint PeccatorHi there! First of all, a very warm welcome to the site. If you're looking for people to do a roleplay idea in a group, you can try the
General Interest Check!
If you're more of a personal, one-on-one approach sort of person, then you can put up an "advertisement" in
1x1 Search.
There are also boards that specifically ask for carefree, sufficient, prolific English usage respectively in
Free,
Casual,
Advanced boards. They're group boards, but you'll see these terms in 1x1 searches too.
Anyway, that wraps up a quick showin' of the ropes. Enjoy roleplaying!