You will need to communicate directly with a West Virginia probate and estates attorney. There will need to be some agreement as to the value of property if he is looking to take property in-kind as a part of his fee. The amount of his fee likely is goverened by WVa statutes.
Usually, contested matters (where you do not sign the Waiver form) are set for a hearing. But it is unclear that you will be given such notice, so it is best to have counsel on your side for the remainder of the process. Talk to an attorney ASAP.