Most of the people will be fairly understanding if you let them know you're new, and you take their advice, it's fairly easy to learn that way
Stay with your team and don't rush ahead, make sure you understand your way around the points system, spitters should die after they spit first, and beware of the Evil One (Meng)
You're really throwing yourself in at the deep end, just having played and coming to play 10 vs 10 here, but it's always the most fun way to learn
Good luck mate, and I hope to see you ingame