There is tutorial for simple/small php/MySQL cart that keeps cart status in sessions, there is even downloadable demo code and online demo.
I'd use a prefab open-source solution. You really don't want to let in silly security issues when you're dealing with other people's money.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.