When you shave doors you remove the handel and the lock. You then fill it in with steel or aluminium then grind it flush with the body lines. There is a tool out there, forget the name but it helps you keep the body line.
The door poppers are nothing more then a remote lever that pulls the door latch down causing the door to open. Most of these are done by remotes, but there are some manual ones that require you to pull a lever or push a button installed under the car.
Also if you have a remote popper, its smart to instal a manual so you can get in to your car.
I'd say check a car forum with what your car is to figure out all the stuff you need. But its pretty much all included in a kit, try stylinconcepts.com to look for a kit. I'm sure they have them.