Your enthusiasm is commended.
However it's a really bad idea to start balling with your mates on an unregulated space. If something goes wrong then it could reflect badly on the whole scene. You need insurance, barriers to protect the public and a lot else besides. Have a look at this:
http://www.ukscenario.com/forum/viewtopic.php?f=5&t=6146
(apologies to the mods if I'm overstepping the linking rules)
the advice above is very good. I wouldn't even bother using your rig until you have spoken face to face with some experienced ballers. Preferably site owners.
I'm relatively new as well and have learnt a lot in a year (by no means everything) by asking questions, reading threads and listening to people.
No. 1: Safety first
No. 2: Safety first
Definitely first thing to do is get along to a walk on.
There are a few in herts, i don't personally know any in oxford. i'm sure there are some.
What are you looking to get into? Scenario or tournament?