there are a number of books written just for the craft entrepenauer, which explain how to market and how to price. To really do well in selling craft items, you will need to avidly market your items--probably develop an online presences with a blog, a FB page, pinterest, instagram, etc. You'll need excellent photography of your items. Most people find that they need a way to accept credit cards--Paypal is a good source for this support.
And pricing--this depends on whether you are just marketing locally or do plan to market via internet. One way to really nail down your pricing is to make up a few samples and keep track of not only the cost of materials, but also the hours involved. then you will need to decide what your minimum hourly wage is that you will work. I do both t-shirt & memory quilts and long arm quilting. I have set prices on both that are within the range fairness--but despite having customers for both, I also have had many decide the pricing is too high. You will need to have some thick skin to deal with those situations!