Seen as though my website runs on sessions and getting information from my own tables, how would I be able to get the session information from Woltlab to make my site work.
Simply set an event listener on saved@LoginPage. Whenever a user sucessfully logs in, also create the cookies necessary for your own page. Do the same for Logout (destroy cookies). The other alternative: make your site read the WCF cookies.
Also how would I change the login page to post to woltlab and stay on the main site without going onto the boards first, would i have to create the login to send and recieve the information to woltlab's user table?
Well, you already have a working login machanism, right? So just change the table against which it checks
Also, can I edit the Woltlab's user table to include my own tables without it crashing?
Why would you want to include them? You can alway do a LEFT JOIN in all relevant queries and get information from other tables as well...