I have a bunch of gay friends and they are a mixed bag, really. Some are pretty much women all the time, some just during some kind of conflict or when the shiz hits the fan in some way. Your mileage may vary, depending on the guy.
From what I have observed, I really wouldn't worry about game if you are gay. Just approach and be straightforward. We all have our crosses to bear in life, gay men certainly beong no exception, but having to asshat around about what you want and decode wtf women are doing or will respond to isn't one of them. Be happy you get to just deal with other men to get laid and just go for it. Just be careful, of course, to make sure your targets are actually gay....straght guys don't respond well to being hit on by guys, to say the least. But from what I've been told, you can pretty much walk up to another gay dude and tell him what you want to do.
Seriously, I don't envy gay men for a lot of reasons and I really can't imagine preferring men over women, but I've seen gay pickup in action and I gotta say.....It must be nice. Just go to gay bars or clubs an hour before last call and you will get all the practice you need. Thats what my one friend always did and even if you screw up, your efforts likely won't go unrewarded. Until he told me about this I did not realize this went on....previously I was in a gay club at last call with a woman once (long story) and it was a sight to behold....The bell rang and the ugly lights cake up....every dude left in the joint without someone basicly just paired off in like 3 mins. They might as well have just done a "shirts and skins" thing like dodgeball in Jr high. Remarkable, really. Being my only time in a gay establishment, I had no idea that this was pretty much the norm till my friend told me.
If it was like that for hetro guys the world would be a far, far, better place. Or maybe not, just more fun. None of us would need any game at all if we knew we could hook up everytime we left the house. Probably nature's way of keeping us on our toes so society doesn't crumble or something.