I will preface this with I am not an expert on all of the paths to becoming an NP, I'm not sure there is anyone who is an expert on all of them, but that's another issue. Also, your location, and what your local schools offer may limit your decisions, but here's what I would suggest you consider:
1. I would examine and consider programs that are designed to take you straight through from nothing to your NP degree. You are already doing nursing, most of these programs are more than four years long, and I would think with that you would have sufficient nursing experience by working part-time during the program. These programs are designed to give you your pre-reqs, RN, and then your NP degrees, so it would be one program that would take you from start to finish. This may require relocating depending on what is available in your location.
2. I would lean towards LPN -> BSN -> NP over LPN -> ADN/RN -> NP because there are many MANY more BSN -> NP options, and this would be a more flexible pathway for you. Of course, if you are in a location that only offers an ADN/RN program locally and have a reason to not move, then that limits your options and you can still do that and then do the RN -> NP programs after that.
3. Online vs. On Campus. Although I'm in an online program, I would say that as a young individual without as much life experience and the resources I have, I would lean towards a on campus program if one was available for me. Again, location and family situations may affect this decision, but I think there would be more support, and I would also opt towards a program where the program at minimum had clinical sites established that you could use if you needed. As someone fresh out of high school, without alot of contacts in the provider community (I'm assuming), I wouldn't want to have to find my own preceptors and be responsible for assessing that these providers would be able to educate me to the degree I felt was necessary for my future success. That would be a bit much to ask of yourself.
4. Don't be in a rush to make a decision today. You have time, explore the options, because there are many out there for you to explore. Take the time to research them extensively and then mull over your options. Don't pick the first one that looks good because there are probably alot that are at least as good, and maybe even better. As you learn about what is available your options and choices may change. There is nothing wrong with taking a year to work in your new role, explore the options and then pick the one that best fits your needs.
5. Don't fear your choice. Although you can make a choice that you will regret, you have many years to correct it. Don't be hesitant to chase your dreams. If you think you know what you want, go for it. There is nothing better than working towards a goal that makes you happy.