Hi Michael,
Welcome to the site. There are no LPNs where I work and other than in a doctor's office, haven't seen one in practice for at least twenty years.
I'm a male RN and never worked as an LPN so can't speak from firsthand experience, but I can share a viewpoint. Before I do that, let me advise you to look up healthcare facilities nearby and job shadow nurses. If possible, locate both LPNs and RNs. Doing so will give you a direct window into what could be your new profession.
Now for my thoughts on nursing education. LPN training is a solid clinical base but the LPN scope of practice while comprehensive is limited. This doesn't mean you couldn't find working in this field rewarding, it does mean that you will have by comparison, a narrower range of work opportunities than an RN will. What this means is that you likely will not practice in acute care.
You mentioned getting LPN training then RN training which is one way to become an RN but it isn't a necessary step. Evening classes are preferable to you which makes the LPN program appealing I'm guessing because you may be working during day. While it may require you to change more than your major, you could become an RN directly. If this is your eventual goal, you will at some point need to relocate or change your source of income to accommodate daytime classes or clinical training- which you will eventually have to do for any nursing education. You may have been thinking you will work as an LPN while attending RN classes and this may be reasonable but first look into the LPN job market and pay scale in your area or anywhere, for that matter.
At this point, I'll make a recommendation. You have completed your liberal arts core and are poised to start business electives but are considering the nursing profession. Having gone that far into baccelaureate preparation and with the addition of a few science corequisite courses, I think your effort would be best put to completing a BSN. The nursing core will essentially take the same amount of time to complete as for an ASN degree and the BSN will offer extended job security at least in the acute and critical care arena. My crystal ball tells me that in the next decade or so, a BSN will be the minimal requirement to work in these areas. Let us know what you decide.
Good luck,
R