Basically, take each separate item, one at a time, and work out exactly how much it costs you to make and sell that item:raw materials, manufacturing costs, selling fees, postage, etc, then DOUBLE it and see how that goes. You mustn't forget that, every year, you'll be liable for tax on all your sales, depending on what other income you may have coming in, so always keep money aside for your tax bills.

If you get any complaints about pricing, or stuff isn't selling as well as you'd anticipated, then perhaps think about dropping your prices, but always start off on the high side as no one likes to see prices going up. At the end of the day it's COMPETITION that will drive your pricing.