Hey where abouts u from? There is a gym in Erith called the Europa Gym (look a few threads down for address) but i don't know what kind of stuff you would be allowed to do there. Unless you go up on one of UFs training days. Other than that just find some low rails and walls and practice vaults as often as you can because they are basically the number one move you will use as a beginner. Once you get more confidence you can move onto higher vaults and longer jumps.
If you want to meet up and train with my crew will be happy to help you learn some of the more complex and higher confidence based moves. Obviously depending on where you are in kent. Anywhere in or near maidstone is good enough.