Mainly cutting 2mm carbon fibre sheet. Min bed size 500 x 300, max bed size - whatever fits in my double garage..!!

I have absolutely no idea were to start but really like the idea of building something from scratch. Where is the best place to start??? The most confusing part for me is the stepper motors and drives, seen and used lots of them but never done any electrical work with them. How expensive will the electrics be as the mechanics wont cost me a great deal at all.

Thanks in advance.