Go the the "Online Events" section of this forum (https://www.gtplanet.net/forum/forumdisplay.php?f=12) and go to either the Racing Series or Clubs section depending on what you're looking for. Browse through the series and clubs until you find one that fits you and follow whatever instructions they have for registration! Most of the groups here are very friendly and helpful so as long as you're polite and play well with others they'll be more than happy to help you get started. 👍
join the GBracingclub mate been a memebr a year now theres everything from clean fair casual stuff to proper events to drift events, great club well worth checking out.
