!st: If you are sure you will be having your first job in SC, it is probably easiest to take the boards in Kansas, but for a SC license. This is completely possible check out how to do that on the NCLEX web site.
"rumors" that you have heard are true. You are applying for endorsement of your license. The fee you pay is not to be able to work in a different state than the original- but a fee paid for licensing. Even if you staying in Kansas, you would need to renew your license every few years and pay a fee for that.
Some states (NY and WA come to mind) require documented education in things like infections disease and also child and elder abuse. The BON in each state usually gives a link where you can do the class on line- for another fee of course.
SC is a "walk through state as well- which means that on a certain day (I think in SC it is Wed only, but that might have changed) you go to the office with all appropriate documentation, and by the end of the day you have a SC license. It's pretty nice that way. You will not be expected as a new employee to assume a charge nurse role (well you shouldn't be expected to...). COmpare my career to my friend who stayed at the same job since graduation. She does night charge, heads some committees, teaches a SIDs greif sessions etc. I have seen a lot of the US, and overseas, but hold essentially a staff RN position. There are things that can travel with you though, like if you were to get certififed to instruct ACLS/PALS, BCLS, or TNCC etc. These are national certs and recognized.
As far as the SAHM thing. If you can do it, I'd work per diem- which means that you wouldjust pick up a few shifts a month at your job- usually they require for you to stay active that you work one 12 hr shift a month. That way you can get paid a bit, and keep up on changes- and you might like to get out of the house occasionally!
In your situation, I would advise that you get documentation of education in child abuse and elder abuse and neglect, and infectious disease. SUrely you have had these in school, and that will save you money as the ID on line for WA costs 40 dollars
Its harder to get documentation after you leave school. Keep the documentation with all other stuff related to license.
Hope this helps Best Wishes!!!!!