Be sure to read the pinned posts at the top of the forum sections, especially the How to Sell and the Before Shipping Us Anything posts.
If you've never done any scrapping be prepared to learn a lot. If you've done any kind of metal scrapping, still be prepared to learn a lot. A good topic to peruse on the different grades is
here.
Also check out the linked pictures and videos in the
payout page for examples.
If you're not sure what to do with certain boards after looking through all that or if you have any specific questions, just pop back in and ask. Do use the What is it? section to upload pictures of any stuff you need help with.