You've been playing for 9 years you say but don't know what gun would be good to start your brother off with
Are you sure this really isn't one of those "I have this friend who..." things where you are really talking about yourself? Because I find it a bit hard to believe that after 9 years of playing you would have such little knowledge.
But anyhow, the best advice as given so far......take him out and let him use a rental for a while. No reason to jump him into gear if he hasn't even really tasted the sport yet. Let him get out there and discover what he likes first. Might prefer woodsball to speedball. Might like a tactical marker. Who knows. Or if he even likes paintball that much at all. If you've been playing for 9 years you should know this.