Keep it outside the waist band and make sure your shirt doesn't cover it. I don't tuck my shirt but I make sure it is up and over the holster. The kind/type of holster might depend on what kind of gun you have. Is it a revolver, glock, or 1911? Everyone is going to have an opinion based on the type of gun you say. You will probably go through two or three before you figure out what you DON'T like before you figure out what you DO like. If you have friends see if you can borrow their holsters to try out. That will save you some money in figuring this out.