For those in online/partially online programs: how?

Hi all.

I'm 19F and I'm starting my nursing program in one week. It's blended meaning I have in person labs and clinicals but online courses and lectures. In the last week I have realized that I am very unprepared to study and manage my time; more so then the average person.

I went to my last two years of high school at an alternative school where you genuinely just had to show up to pass. It was really bad. As result I have none of the skills needed to succeed in college.

So I really need assistance with the basics; managing my time and studying. I find that i usually try to finish all the work given to me at once and then i get overwhelmed. I don't know how to space it out in a way that won't stress me out but I still get everything done in a timely manner. For studying, I just don't know how. I used to rewrite what I learned into my own words and then reread that. That's all I got. Like I haven't the slightest clue how to learn and process information beyond that. It doesn't help that I have ADHD, and although meds do help when I don't know what to do with my focus it's useless.

So yeah, any advice would be appreciated greatly. I understand that I may need more time to learn this as a skill completely, but I don't know where to start and I'm genuinely so embarrassed.

TDLR: went to alt highschool which taught me nothing, can't study or manage time at all. Absolutely zero idea where to start. Online classes start in a week.