Hi I am in the same position as you. I graduated with my MPH degree in May 2011 and I am entering nursing school
for the ADN degree next month. I have not been able to find a job with just my MPH, which is why I decided to go back to school. I had to complete pre reqs too, some of which are not even necessary for the school I will be attending, but each school is different. I chose to go the ADN route because I just want to be done quicker. There are accelerated BSN and MSN programs for people who already have degrees. But they would be more expensive than going to a community college and it takes a little longer. But if you really want to go into nursing I say go for it. Depending on your situation with financial aid and student loans you may want to look into cheaper schools
. I don't think going to get the RN would be a waste of time because I have seen plenty of MPH geared jobs that require a RN license, which is why I decided to go back to school. Good luck with whatever you decide.