Hi mate. I'm also new around here. There's a wealth of useful info and guidance posted by members, so either spend some time searching for the topics/keywords that catch your eye, or simply dive into a few threads and read through them.
A few key things I've picked up since joining: BAC water quality — you really should get this from a separate source, since the BAC supplied by vendors often doesn't seem to be good quality according to many people. Also, read up on any potential vendors you come across and check the COA for whatever products you're thinking of buying. It looks like plenty of folks in the US are organising group tests on their purchases, though I'm not sure whether people in the UK can do the same.
Right now, new members can only post in this thread, so you'll definitely need to get involved in the threads to learn, or hope that someone knowledgeable drops by your thread so you can chat with them.
Hope this helps