Welcome,
As far as selling stamps here are your choices;
1. take them to a stamp dealer and sell them
2. take them to a stamp show and sell them to a dealer
3. sell them online (i.e.
ebay or another online auction site)
4. Take them to a stamp club and sell them to another collector
5. Join an organization like APS and sell them in mailing 'circuits' to other collectors
Note: Rules prevent anyone from selling their stamps on this forum until they have 50+ quality posts. Please do not try to sell them here until you have reached this milestone.
Don