You'll figure out what you need to charge after the first leaf clean-up. Just try not to schedule too much work during those days.
Now for the best advice I can give you:
1. Don't let customers set your prices. If you ask them what they think it's worth they'll offer you the least amount of money possible.
2. Don't go by what others are charging. It's alright to use it as a guideline, but only you know your expenses.
3. Don't offer cheap prices just to get the work. Customers will expect you to do it for next-to-nothing from now on, and if you try to raise your prices they'll talk bad about you to their friends and family.
4. Even if you have a place to dump it for free charge a dump fee. You may not always have that place available, and you need to be compensated for you time, gas, and equipment to haul it off.