SNAIL was initially created for Intermediate skill level players. Within a few months, and since, SNAIL embraced all skill levels. Not all skill levels have been able to embrace SNAIL. Admittedly, with our current active population, all skill levels are competing in a single division. The system SNAIL uses to match skill levels works best when we have enough active drivers to populate 3-5 (48- 80 players) divisions.
You're more than welcome to join any of the practice/warmup rooms that get posted throughout the week and the "Official" Thursday practice event as well. I would suggest you start by having a look/read at the first post in the main thread, which is where the practice lobby "alerts" are posted. You're welcome to ask any questions you have there, someone should be able to answer them, given enough time. You may also find, if you join a practice lobby, one or more of the members has a PSN audio chat room up and available to join.
Welcome to GTPlanet.net/snail and I look forward to seeing your request to join.