What’s the best way to sell an online auto repair manual to DIY’ers ?

1) By membership – They make a yearly payment and get access to all of the material all year long…and how for much?
2) By problem – they pay for a specific manual when they have a specific problem – for how much?

1 but how much for the annual payment? how about a one time fee for the car/ truck they own and an annual fee for any other make and model, regardless of ownership.

Online Auto Repair Manuals