Get new boots. If the boots don't fit properly it will 100% ruin your holiday. I made this mistake on my frist ever trip. Blisters and constant foot pain is not nice.
To get correct fitting bindings for the board you need to take your boots / board with you and go sample. You need roughly equal toe & heel overhang (slightly more heel is poss) to aid you when riding. Buying random tech of eBay is probably they first error you will make, everybody does it. But spend the ££ on boots. You wont regret it, they are the first n foremost most important piece of kit you need (More so than board & bindings).
If you cant get to a local shop, basically;
Measure your boots, you don't want to much overhand 5/6mm is perfect over the front & rear of the board.
Look at Courchevel. Its part of the 3 valleys in France. Courchevel, Méribel and Val'Thorens. You can buy list passes for just Couchevel but would recommend getting a 3 valleys pass and go explore. Also the DC Pro pack is in Méribel and makes for epic viewing even if you cannot ride the lines (There is n00b lines btw).
You mentioned your board is a 166cm? How much do you weigh? Because that board is MASSIVE. I'm roughly 13.5 stone.. and I'm a size 154cm ...
Good luck. Its a mine field!