This is the most commonly asked question. There are some hard fast rules about this, but the truth is that it will be different for everyone. Your location plays a big part in determining how much to charge. Check your competitor’s prices. When you’re first starting out, you don’t want to be the most expensive or the cheapest. Situation yourself somewhere in the middle.
However, do not underprice yourself. Think about the value of your time. What are you worth? Take this into consideration when determining your pricing structure.