My suggestion: start with strong subcultures. Become known to drifters as the people who have all the data on 240sx's, or to Jeep people who have specs on every single difference between each model year. Develop a good reputation with each community before moving to the next. Toyodiy is a great resource for me that does what you're doing, but it's not available in handy app form. Basically a comprehensive catalog of every Toyota model every made, with microfiches, parts lists, part cost estimates, task tutorials, and the ability to find your car not only by model and year, but by different models or body styles/trim styles within the same year. Unbelievably comprehensive and very uesful. If you can be as good as them (and they are nonprofit) on a mobile app, even if it's just for toyotas, all you will have to do is shut up and take my money.