Many ham clubs nowadays sponsor classes - that's one of the best ways to go. Sometimes the 'final exam' is the actual test; at that point, if you pass the exam, you'll get your license shortly thereafter.
The other way is to buy one of the study guides (such as those sold by the ARRL) and take the test at a local hamfest. Often these are announced as part of the hamfest beforehand, either by a flyer or on the net.
Many hams aren't fond of non hams having amateur gear (unless the transmit capability has been disabled, and there are several ways to do this) because of the temptation to transmit without a license (which is not to say you, or anyone else would do it...). A scanner is often the better bet - however, as you found out, scanners in vehicles are a no-no in Indiana. Unfortunately there isn't a radio out there (yet) that can do P-25 trunking and transmit on 144/450 mhz (although I can't really see why not - the technology is there to do it...) although many ham radios can receive freqs well outside the amateur service.
I would plot out your normal route going home, then use the database to see just what kind of scanner you will need. Our wiki area is quite complete with most all the current models well documented - once you have made your decision, you will be well on your way.
73s Mike