Your best bet to actually make sales is to enter everything you have for trade / sale into your collection. Once they are all entered in your collection, post here in the Forums that you are looking to sell. The members who are into buying on this site will then look to see if you have cards they are interested in. If they do, they will either make you an offer or ask how much you would be asking for the cards they are interested. There is no use to bring ebay into the mix.
The problem you may have is that being new here and not having any feedback ratings, some may not risk sending you money on the promise of getting the cards they thought they were buying. You may be asked to ship first and wait for payment once the cards have been received.
Bruno
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Check my Profile page to see my 2023 Goals and my Lists of sets near completion (5 cards or less) or sets getting close (less than 100 cards missing and 75% complete).
https://www.tcdb.com/Forum.cfm/Page/B/ID/0/?MODE=VIEW&ThreadID=25745&C=0