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@MrsShaw this is the link to the circular swap section of the forums. You can look at previous CS. Most people post pictures of what was in the box when it arrived, what they kept and what they added. It will give you an idea of what to expect. I think the calibama thread may have been the most active from CS5. They went 3 rounds.
You will also want to take a look at a previous sign up thread as their are requirements to be able to join a CS. The requirements relate to length of time as a member, number of posts, or trades with members who have left positive feedback on your trade.