Welcome Read all the pinned posts, lots of information, and use the search tool. http://www.airsoft-forums.co.uk/index.php/topic/12854-new-player-guides-info/
No, do not waste money buying two-tone. Hire guns for your three games to get site membership, then just buy a RIF. A valid defence can be achieved in 2 months, which gives you time to reseach, ask questions, change your mind, research more, and then hopefully get a decent gun that suits your budget and needs. You do not need to be on the UKARA register to buy a RIF. Here is a link to FAQ on UKARA http://www.airsoft-forums.co.uk/index.php/topic/1254-popular-ukara-questions/