Hi Lou,

Unfortunately, based on your description, I don't think your stamps will be worth too much. The sheet of space stamps at most $5-10 and the First Day Covers a few dollars each. In my opinion (and its only one person's opinion) you should sell them all as one group. If you have an eBay account and are familiar with selling on eBay that would be your best bet. Hobbizine has a free classified ad service. There are fewer potential customers here, but you can set your own price and keep the ad running as long as you want. Hope this helps.
Paul