There are lots of different ways of applying the basic technique of vacuum bagging. Different applications will require different materials. "Release" is a very broad term which applies to several different materials. Basically, it is something which the resin will not stick to, allowing you to separate the finished part from something else. The release can be wax, a plastic film, a porous layer such as film with a bunch of holes in it, or even a woven nylon or Teflon coated fiberglass release fabric. Breather material is generally a bulky synthetic mat, which provides a clear path for the air inside the bag to be pulled out through. Breather also absorbs any excess resin which is pulled through the release film. Even paper towels can be used for the breather (cheap).

It sounds like what you're trying to do is use your foam plug as a male mold and just lay the glass on the outside of that. This will work fine, and you should not need vacuum for this. In fact, it is rather difficult to vacuum bag extreme compound shapes, as the bag isn't all that stretchy. There are stretch bag materials available, but it is still limited.

If you can cover the foam plug with a low-temp iron-on film, then wax it, you should be good to go. Use small pieces of fabric to go over the compound areas. You will need to fill and sand the outer surface, but the only way around that is to make a full female mold.

-David