1) There is no one specific "Pre-req course" of study. This is why it is important to know which program or programs you want to apply to, as each may have slightly different pre-req course requirements. I would suggest googling "community college" and your city name to find community colleges local to you.
2) It is possible to get an RN/MSN-NP at the same time as direct entry programs for non-nurses exist. There are not a lot of these programs and this option may or may not be the best fit for your circumstances. (Is there a program near you? Time? Money? etc.). By and large these programs are highly competitive and very expensive.
However, if NP is your goal there are many pathways to that end, including starting at a community college and getting an ADN; getting a BSN as a post-bacc student through a traditional BSN program (will typically take 2 years as post-bacc student), or via an ABSN program and then bridging from any of these programs to a MSN-NP program (with or with out work experience along the way).
I would suggest doing some serious research into schools in your area (or areas your would be willing to move to) and finding out which options of study works best for you - including geographic location, ability to work/not work, cost, length of time, flexibility (in case you have outside obligations like children or caring for older relative), and your own ability to learn in academic settings. (Joint RN/MSN and ABSN programs are extremely intense information wise - if you don't have super solid study skills, confidence in with science coursework, and the ability to learn very quickly - including from self-study - a slower pace may be better for you). Of note, most Acute-Care NP programs want at least a couple of years of work experience as an RN - so it may be to your benefit to work on getting your RN first (via whatever option makes sense), working for a few years and then applying.
3) I am not familiar with either community colleges or nursing programs in Tennessee. I believe Vanderbilt *does* have a direct-entry MSN-NP program, however I am sure there are other nursing programs in your state. I'd suggest googling "Tennessee Board of Nursing" and using their website to find nursing schools accredited in Tennessee. Once you have a list of schools in your area go to each school website and look at their admissions information - including cost, length of study, and admissions criteria - this last piece will help determine what classes you need to take from the community college to satisfy pre-req requirements.