i got 7.8 btc and i do not know where to sell them. i tried eBay but some people cancel the order before i get pay. so if any one know a place i can sell the please let me know. thanks
I'am not sure what payment method you are looking for , but since you are using Ebay I will assume you are looking for Paypal .
You could sell them here on Currency exchange section , however make sure you trade with trusted member (green trust) + use escrow just to make sure they don't reverse the transaction later because as you know PayPal is easy to reverse .
Edit : read this useful article :
http://www.coindesk.com/information/sell-bitcoin/