It depends on what you plan on selling. Do a search on Etsy on similar items and check out the other sellers. You can see the items they have sold, but not the amount they sold for.
Also, it helps if you relist the items every few days to bump it back up to the first page. That will make your listing fees higher but you may sell your goods faster. Let say you're selling quilted table runners.... do a search, see how many there are for sale, and when the last one on the first page was listed. I sell fabric and some days my items are on page two within a few hours and page umpteen within a week if I don't relist. Good pictures are also very helpful. You can put up to five pictures so take pictures from every angle, close ups, and full view.
There is a community section on Etsy. Be sure to use it because it's very helpful when asking for help and advice on how Etsy work.