Welcome, like Walkie says, you've come to the right place - rest assured.
Sure ebay might seem like a good place to sell but it can also be very risky, and it's populated by morons (largely).
First of all, post some pics of what you have, not individual shots, just a couple of pics of everything, we can tell you then if you have any rarities.
Some of the guys one here will pay handsomely for pieces they need for their collection - and there will be no rip off fees like ebay. It's fairly transparent on here and you'll get market value or very close to it.
Final Frontier's prices may seem outrageous but you'll get nowhere close to what they ask for their items, they have to make a profit after all and especially if you sell in bulk.
Good luck with your sales and here's hoping you have some original Helix stuff, a boxed diecast Tie Bomber and a boxed ESB Boba Fett 12" :wink: