AI tax deductability, business use??, experience?

I guess I'm just cheap, frugal would be the polite reference I suppose, but I get tired of a bloated Gov't slopping around in the public trough trying to act important and benevolent to the masses of the "great unwashed"! That should leave no doubt of my position. I'm retired military, a health care professional, and an educator at the post doctorate level which means I know about paying taxes!! All that said, I have maintained since the 70's a small clock business, buying, selling, fixing, transporting, and maintaining vintage European clocks in my spare time. (that's a joke!) My question finally is this: How do I take advantage of the tax code in purchasing and maintaining an Interstate. What are your thoughts?

Thanks in advance!