Hi, I used to be in the same situation like you before , so I understand ur feeling. I'd like to try my best to help you out, give you some ideas about nursing.
1) ADN =associate degree in nursing
2) BSN = bachelor degree in nursing
So yeah, you need to take general educational (GE ) courses to earn your degree at the end. You don't need to take all GE classes before taking prerequisites. Depending on ur strength in study, you can take 1-2 core prerequisites with some GE classes which you think you can handle. It's the best that you talk with counselor. They can answer your questions and help you set up an educational plan for what classes or when you can take them.
To take the road ADN, and then do RN-BSN program or go straight to BSN , you have to be the person who decide it . We can't help you with it. You can google. There are many topics in this forum about it. However, since it's very competitive in applying for nursing program, I recommend you to apply for both ADN and BSN programs to see how things work out unless you are strong-confident in your choice-school.