I just happen to be your assigned welcoming committee member too XD So welcome! Consider this your tarvalon.net official welcome! While right now you can only see a limited number of forums, once you have 25 posts under your belt you can apply to be a citizen of Tar Valon and that's where all the fun is 
You may post topics and replies to any forum you can see, though in the discussion forums I would stick to the Books 1-4 section so you aren't exposed to too many spoilers! If you need help don't hesitate to ask, we are all very friendly, and please also check out the stickies for more info. I can tell you right now your avatar isn't the proper size so before someone else mentions it, check out the avvie and sig sticky for details on sizing. Most of all, Welcome! 
You may post topics and replies to any forum you can see, though in the discussion forums I would stick to the Books 1-4 section so you aren't exposed to too many spoilers! If you need help don't hesitate to ask, we are all very friendly, and please also check out the stickies for more info. I can tell you right now your avatar isn't the proper size so before someone else mentions it, check out the avvie and sig sticky for details on sizing. Most of all, Welcome!