H4mmerhead

Hey guys, Just got the game today, and there is a few things i am wondering. First of all, is it possible to choose what map you want to play on? I haven't been able to find out how to do that :/ And second, is there a way to bring up a map of some sort? To see where you are? Seems like a cool game, just having some newbie problems :) Hope anyone can help with this, thanks :)