There are shipping places here (Ship On Site) that will list things on e-bay for you. They will take the picture, post it, help you price it, and handle the sale and shipping for you. There is probably something similar where you are.
Something I have found helpful is to try not to tackle it all at once. Make a goal to do one thing a day. Tomorrow you could take the bags of clothes to Goodwill or some other charity. Or take the designer clothes to a consignment shop. Sometimes I end up giving stuff away just because of the hassle factor of selling it, and I need to get it out of the house!
Grits
2010 Trek 5.2 Madone WSD, SI Diva Gel Flow
2002 Terry Classic, Terry Liberator