Hi April, there are literally hundreds if not thousands of schools
offering online courses. I went through nursing they way you seem to want to, a few classes at a time. (Back in those old days though there wasn't any internet.) And am now doing my BSN online.
I would first look to your local schools. There you can qualify for state residency tuition rates which are cheaper. Almost all schools are offering and adding more and more online versions of the on-campus classes. Here in my town St. Petersburg College has an every growing number of online courses, degrees. Many of which can be applied to a nursing degree.
If you are just starting out, there are plenty of online courses like history, sociology, Englishes, maths, physchology, etc. that you can go ahead and take on a part-time basis while you are in school. Check with the school that you would eventually like to go to nursing school
at first and go from there.
Good luck to you in whatever you do!