Welcome.
I don't want to discourage you, but there is a big learning curve before you can hope to be successful as a seller. From a purely economic point of view, it is usually just not worth the massive investment of time, unless you are genuinely interested in stamps and plan to continue to collect.
As a hobby, you can derive hours of interest from a $2 envelope full of stamps. As a seller, the $2 you got for that envelope of stamps (more like $1 by the time
ebay is through with you) doesn't go very far.
But again, it is not my goal to discourage you as a potential seller of stamps...everyone here likes to look at stamps. Feel free to post some pics.