At my school, you have to have your CNA before entering the program.
As far as LPN vs RN, this is just my opinion, but why go one year when you can just go two and make twice as much money? I also think the lpn is a waste of time if you are planning on going on to your masters or bachelors. JUST MY OPINION.
If you seriously are interested in a masters, there are RN-MSN bridge programs, but they are fast track and very competitive. I am considering it, but only after I am deep in nursing school will I seriously entertain the thought b/c I have no idea how it'll be a year from now when I am in the nitty-gritty.
Good luck to you in what you deicde!!