If you are going to sell second hand things it will take a lot of work to earn a living! I have sold a lot of things on e-bay and find it a pain, witing for money, going to the post office, every day to give good service, people not paying and having to relist items, if they don't sell, paying to relist again, I think the best selling things are the new things of good quality, and you have to be able to buy these things at a good price to begin with.
Its ok if you want to earn �10-�20 a week selling your old clothes, but you have to sell a lot for that!
Its easier to go out and work!!