Post pictures. At your membership level you need to use a photo hosting site.
Don't ask for value (at your current membership level), or your posts will be deleted by moderators for rules violation.
The members here can likely tell you what you have if you post good pics, and you can deduce from that if they are worth selling, and research their values elsewhere online..
As a Gold member you can post pictures directly from your computer, ask for values, and sell knives on this forum (in the Exchange, not here in General). To learn more about becoming a Gold member, click on "Paid Subscriptions" in the dark blue strip across the top of the screen.