Not really sure what you mean, I'm sorry. Where do you want to make a new thread? Most if not all parts of the forums if I recall correctly will have a ">Post a New Thread [Forum Name] at the top of near the top of all forums.
If you can clarify what you mean at bit, I can try to help out if you haven't gotten a answer yet from someone else.
Greetings and welcome to Pokebeach; what brings you to my wall?
To answer your question about how prereleases work:
Prereleases cost $25 for an entry fee (most premier events are free), but that is just because all the materials required for playing will be given to you.
You'll be given 6 packs of the new set, and from the cards within, you are going to construct a 40-card deck - then you'll play Swiss rounds with matches played for 4 prizes instead of 6. (Rounds are also 20 minutes long instead of 30.)
You aren't restricted to the 4-per-deck rule and all the basic energy you'll need will be provided, but you aren't allowed to trade mid-tournament to adjust your deck. If you play all the way to the end of the day you'll get 2 more packs. In the middle of the day you'll also get a prerelease promo card plus a plastic deckbox.
All in all you're getting about $40 worth of goodies for only $25, plus you have a fun day of hanging out.
StarSpliter, Sorry man, but I know exactly NOTHING about the TCG, if that's what you're inquiring. I'm a Video Game moderator, so it's to be expected, haha. Here you can find a list of all the moderators, so find a TCG moderator among those and ask away! If you need anything else, like I said before, just ask.