Now that you have got your start-up launched (how to: see here) it's worth giving lots of attention to setting fees. Just imagine the impact of an extra 10% per hour over a month...
Here are my thoughts:
1. Price by value not cost. Keep increasing your value and hence increase your fees.
2. As you pull away from the crowd and get better and better your fees can be disproportionately greater.
3. Don't discount. There is no discount for volume if you are a consultant.
4. Keep an eye on your competitor's pricing: not to copy them but to know what your customers will be comparing you with.
5. Be clear on payment terms, T&C and extras/expenses.
and then check out the usual wisdom and thoughfulness from David Maister on this subject.