Some noobie questions

Hello. I heard that LOTRO was going free to play, but I coudn't wait! I'm just downloading the trial now, and I have a few questions.

When the beta comes out, will you have to download it all over again or will it just be a big patch/update?

And will you have to create a new account and stuff?


Also, a game related question.
Could some explain to me the difference of a Lore Master and a Rune Keeper?

Thanks.