It depends a lot on your area, I am currently in the process of starting my business officially. I started by checking the competitors in my area. But fondant decorations are where I am having a problem, your characters are great by the way. You can look on etsy for fondant toppers and get an idea of what people are selling theirs for but basically it comes down to how intricate the design is, if you want to get paid hourly and include your ingredients. Most of them are fairly simple cut outs, I'd probably charge .50 each and maybe discount one or two since there are so many but your characters you can charge a flat fee or time plus ingredients. I'd hate to undervalue your work, and since I don't know how long it took you to make them I'd say anywhere from $5-15 each, they really are lovely. Whatever you do be firm with your price.