Need another information about drilling holes in Neckpocket and neck.

The question is simple:
Are holes in neck and heel are similar?

I just dont know, how to insert these screws.
Do i need larger Holes in body for bolts so bolts/screws can easily go through, or i need to screw them through the body?

Its hard to explain, becouse english is my 3rd language, but i made some picture in paint

So, how should i install all this?