Make bullet not collide with you, isnt that an answer in question ) say an enemy tank, the enemy tank gets busted, and so does your bullet.
Just look threw all of the examples, they are must go threw, if you have a license as I see you do and you intend to get some money from that investment of yours.
I am in the process of making a full free game myself(demo link available to see if you klick my name and scroll down). A week ago I had zero experience in making any sort of game, let alone say programing, music, art for games. in 4 days I had that demo cooked up and posted on Arcade. I cant imagine what will come out of it eventually, but I am sure some people might really like it.
So good luck with your creation!