How can I store Brie for a long period?
IMO, It it not the best situation.

Freeze them up. 

It will not be as good as the unfrozen cheese.

Cut them in manageable portions, wrap them up in plastic film and put in freezer bag, freeze as quickly as possible.

For the cheese you want to keep in the fridge, I suggest finding cheese wrapper and wrap the cheese in it while keeping them in the fridge (you can also use wax paper)