Sounds like you're looking for templates since you claim to already have images to work with. You should be able to find templates easily on the web (do a google search), or you can download them from the place where I have my albums printed. Their URL is:
If you're looking for ideas, just check out CD's you own. I'm currently putting together the artwork for the album I'm releasing in April, and I've been using my collection as a reference. When I began to examine them closely, I was shocked to see how little effort goes into many professional inserts and album covers. Yet they still look good. It's a good source to determine what the industry standards are and what you need to do to match them.