Race Department is well established, a legit site run by professionals and long standing well intentioned enthusiasts. The site is a sort of meca for creators, most things (legal) get hosted on the site and are available as free downloads.
The premium service they offer entitles you to join up with their organised races, and a number of other entitlements. What is (or was) a good sense of friendly community when joining up on races, on voice coms they're a nice bunch. I sub myself, and if for nothing else 13 odd quid a year for the unlimited content they host is fair recompense.
SimGP is home to a number of different organisations that offer free membership of their various racing series. Even if you do or don't go with RD id recommend joining one, i've noticed over the last week online that there's a ton of new players, you'll find your level easily.
@petey
Less designing, more driving.
Unless you want to do a Lexus.