I am creating a 2d Shooter similar to Microsoft's "Outlaws" except you wont move around and other things, but how do I make the images i.e,

Do I make the background and make the enemys pop-up and pop-down after a certain amount of time, or do I make a large animated picture and have it so that if you click a certain part of the picture like the enemy, they disappear or something.

Do I make any sense???????

I have everything else worked out, I think...
Ok Thanx.