I'm left handed and shoot right handed it is very common. Though I can shoot with either hand it actually feels more natural for me to shoot right handed.
Should Ilook for a left handed rifle when I look into buying a rifle?
You can do either way. If you already havea right handed gun there is no reason you can't shoot it left handed. I've hurt my right wrist and have to shoot the bigger guns left handed and I don't have any probelms shooting right handed guns left handed.