Pre order questions?

Planning on pre ordering Mass Effect 3 N7 Edition from Gamestop this week and want to know a few things.

1. Do I need like a down payment to start the preorder or will like $5 do?

2. Can I bring in the final amount of money needed on the day of release or do I need it before then?

Also forgot...

3. Does preordering cost the same price or is it more due to preordering it?