Virginia requires a bill of sale to register and title cars.
In most cases, a Virginia bill of sale does not require notarization. However, certain transactions, such as real estate transfers, may require notarization for validity. It's always best to consult with legal professionals for specific requirements.
Factoring can be very beneficial, as long as you are with trustworthy people with the finances to back your invoices, and they aren't taking too high of a percentage. Ultimately, it has to work for you.