You have come to the right place mate. Welcome!
A suggestion would be to try all of the servers (Details below) - especially during peak time hours - find the ones you like then start playing there on a regular basis. Thats the bit everyone knows, the bit that really helps is Interact
with the guys on the server and people will get to kow you quickly.
You will also find alot of the community on here as well as on the servers so a good way to quickly make friends is to get stuck in with the threads and the shoutbox. Server details are on the following links:
CS:GO - http://forums.ukcs.net/viewtopic.php?f=152&t=58011
CS:S - http://forums.ukcs.net/viewtopic.php?f=13&t=41552
Feel free to add me on SteamFriends.
PM me if you have a question, or even better post on the forums, more help and greater exposure to the other players.