"Account suspended" generally means that the device was either reported as lost or stolen or the owner was late in paying his bills. Doubtful that you will be able to activate it if that is the case.
"Account already exists" means the previous owner did not cancel their BIS account, therefore that must be done before you can set up your email. In most cases, the previuos owner needs to contact their carrier and cancel their BIS service as well as the phone service.
"edge" generally means there is no data connection available. The device needs to be provisioned by your carrier and the proper service books needs to be sent. Since you are have the other issues, it is not likely this will happen until/if you get the PIN released for you to use.
Here is a link about buying a used BB on eBay. Buying a BlackBerry off eBay - BlackBerryFAQ