"Can I, sell the inherited house if my brother and sister are named on the will ?

The only legal action that can be taken is where the house is - Virginia. Re-post there.

Can a company back bill me because of a mistake on their part?

You did not say you paid. If you have not, you owe. It is your responsibility to check your credit card charges.

Decide where you want to be, register there, then buy under your business name..

Will I be obligated to purchase this vehicle?

Do not attempt to purchase a car without a license. How would you register it or get insurance. Run away from these people.

You can wait and be suddenly surprised or you can move in an organized manner.

After there is a judgment, you can negotiate a repayment plan. You should start saving now.

Will an inherited, separate beach house change into marital property (transmutation) if joint funds are used to pay bills/fees?

Ask the question in the state the beach house is. In Maryland, the party paying half the bills has some interest in the property upon divorce.

I hired a process server for contempt of alimony

A lawyer would draw up a motion for alternative service that would likely be effective.

You need to sit down with a bankruptcy attorney and review all the facts. Review first , act second.

How can the state keep a husband and wife apart if neither spouse pressed charges?

You need to get him a federal criminal lawyer.