I do the same thing. Always welcome them in game chat.....and make sure by private message that they know what they're in for if they've joined a terminator game....or an rt game.......
I find that telling them about all the info available on forum threads, and offering to answer any questions they might have go's a long way to preventing deadbeating as well.
Its also useful to explain how quickly their rep will get toasted if they do deadbeat.....

Once they realize we were all noobs at one point, most will do the right thing. And we don't want the ones who don't anyway do we?
