First & foremost, welcome to the site!
I'd suggest you take a few moments to build out your collection list, including both your wantlist and what you have available for sale/trade. That way, potential trading partners (like me? I have quite a few Roberto Alomar cards on my FS/T list.) can see what you have available through system, and the transaction manager can help manager inventories on both sides.
There are a few "new member" guidance threads in the forums that you might want to peruse. Here are a couple of examples:
https://www.tcdb.com/Forum.cfm/Page/I/ID/0/?MODE=VIEW&ThreadID=25878
https://www.tcdb.com/Forum.cfm/Page/I/ID/0/?MODE=VIEW&ThreadID=39189
Additionally, site FAQs can be found here which contains some very valuable information about addition to your collection lists and how to trade on this site.
Again, welcome to the site!