first thing, look into what is available in your area & what is financially sound. this is a big decision maker for most peolpe. the other thing to remember is that the rn is a license, and the adn or bsn are degrees. upon graduation from either the adn/bsn or occasional diploma program, you are then eligible to take the rn boards.
i'm not sure if this is available over in in, but here in il at my community college, at the end of the first year of the rn program, you can take a summer class (lpn exit). you are then eligible to take the lpn boards. some people stop then, others work as an lpn while finishing up the last year of the adn program.
also, you do not necessarily have to take 3 years to do the adn programs. yes, it is probably easier, especilly if you have kids and or need to work. there are 5 people in my class & probably at least that many in second level, that are doing the entire program in 2 years.
at my school, the non-nursing classes are called support classes, not pre-reqs, none of them are required before starting the nursing program.
if you go to a regular lpn school, you will still need to take the support classes for the rn program.
hope i haven't confused you even more.