Rosetta Stone builds your vocabulary really fast --(this was my favorite)--but you need to know how to read a little bit since it doesn't go over the letters or grammar or anything.

The best grammar book I think is New Penguin.

Pimsleur is really good and I would say more beginning than Rosetta Stone. You might be able to get it from the library and if you can I would do that first before Rosetta Stone.