Hi,
Check out
this thread for a great calculator to help determine rates.
There are also fee calculator tools in
The 2-Second Commute and
The Virtual Assistant's Start-Up Manual, both of which also contain other invaluable info to help set up your business. You can read more about these books and find links to purchase them in the
Book Review section here on the forums. I did those book reviews and would recommend either book, but quite frankly,
The 2-Second Commute is less expensive and contains more in-depth information for someone just starting out in the VA world.
Hope this helps!