As a fellow support main, who went to top and then back to support... best thing is to go into practice tool or a custom and practice cs'ing with who you want to play.
If you like tank supports-> try top
If you like mage/utility mages -> try mid or ivern jg XD
If you feel like you want to help lanes outplay jg (i think of it as just roaming support, but meh you do you)
I think the biggest thing about laning is farming and learniong how to farm under pressure. Going into customs to reach 100 cs by 10 min solo, then working up into trying to get that while under heavy poke from like Brand bot or Ziggs bot, I feel like you will start doing better. If the other laner is stomping you in lane, as long as you can play safe and still keep up farm somehow, it won't matter because you will still be useful later in the game.
If you're going for jg as a role, try keeping track of the other jg to avoid getting counter jg'd over and over, and learn more about jg paths and the most efficient way to clear your jg while maintaining good map presence through ganks.
That's my advice... Hope it helps!
[slayer-jinx-catface]