Hello and welcome to the boards!
You sound like you have done some research. Enrolling in your community college to get your ADN is a good start.
Depending on where you stand financially, and how much time you are willing to put into it, I always encourage people to get their BSN if at all possible. The reason I do this, is because almost all the ADN's I know of (students included) plan to go back to school at some point to get that degree. Not becuase BSN's make much more that ADN's, but because the BSN is needed to pursue Master's degrees. And that's where the best money is. (CRNA, NP, etc..)
On the other hand, if you are like many of us (myself included) opting for the 2 year ADN program is the fastest way to get out there and start working, with the goal of continuing your eduacation part time. Some hospitals are staring to require it anyway. (BSN within so many years)
Do you already have a college degree? Have you taken some of the prerequiste courses for the ADN program? (Anatomy, microbiology, psychology, etc..)? Because once you factor in all those classes, and depending on which classes your program will let you take concurrently, the ADN route ends up being a little more than 2 years.
As for CNA experience, I don't think it will matter. What it will do is give you a good foundation and a greater appreciation for what these people do, and since ultimately as an RN you will delegate tasks to them, it will help you. But will it give you much of an edge with schooling? Nope. As a matter of fact, by the end of your first semester in ADN school, you will have surpassed CNA duties. I do think one has to be licensed in most states to be a CNA too.
An LPN is very much like an RN, except the program needed for that one is only one year (not sure about their prereq's) The entry level pay isn't as good, though I have heard of some long time LPN's making better money than brand-new RN's.
Best of luck to you in your endeavors!!
One last thought. Does your nursing program offer an LPN to RN tract? If so, that may be the fastest way to go in order to make a little better money while pursuing your RN.