Any time you click on the swap, you'll see (at the top) how many tickets you have to spend (1 ticket = 1 "dib" or 1 packet to claim).
Also look at the links at the top of the page under "Your Profile" and under "The Swap." If you need a quick refresher, watch Dave's tutorial again.
By clicking on our swap and then clicking on "access the full tradelist for the swap," you can see everything that people have listed so far. You can also put things on your "wish list" by clicking on the stars.
Your wish list items WILL NOT BE automatically "dibbed" for you or anything, it's just a way for YOU to keep track of your most wanted items, so you know what to try to call dibs on first. After the first few days, that won't be such an issue, as you'll have more and more tickets to spend each day.