Putting a price-tag on what you do is not an easy thing.
Use this free calculator to estimate your hourly rate.
Now, of course it takes more than a basic calculator to figure out what you are really worth. You need to also factor in many things like your knowledge, experience, your ideal client, etc but it gives you a much better starting point. (just a note: don’t use commas in your numbers-for some reason it won’t work if ya do.)