Originally Posted by Platinum ChrisM

You pay 8% on whatever the sell price is. If the Blackbook value is higher than what you paid, you pay 8% on the blackbook value.

Since you are are buying it privately, you need to have the used car package. Otherwise, the current owner needs to go with you to the DMV office.

You need a saftey certification to have the vehicle put into your name.
At that point, I believe you can get a trip permit without the emissions test since you are not plating it.
But when you do get the trip permit and start driving it, be prepared to be pulled over... alot. So make sure there's insurance on it, or its a $5,000 fine.