Question about going the LPN route..

Hello! I'm going to graduate in December with my AS in Medical Insurance (not really what I wanted to do, but settled after having 2 little boys in the past 3 years and wanted an opportunity to work from home and be here during the day) but am going to start taking weekend CNA classes in the next couple of months. I plan to be a CNA for awhile (a long time ) so that I can pay off some loans and than hopefully find a hospital or facility that will help me pay for the LPN program, but I was wondering..If having a AS all ready, would some of those credits transfer? I know I would have to take nursing related courses, but what about the core classes? And what does and average LPN course timewise take? Sorry for so many questions and thanks in advance!