You need to have the title of the vehicle. The title needs to be signed by you and a notary. Any paperwork about the price of the vehicle is up to you.

'Paperwork' is a general term and does not need to be pluralized. It infers plurality, and to singularize it, you would say 'a piece of paperwork'.

How paperwork is handled depends upon which government you are talking about and what the paperwork is for.

what writing do they use in Ghana paperwork

You don't know without the paperwork.