Question about Transcripts

So I transferred from private school to online schooling my senior year, and I was wondering how I am supposed to go about requesting transcripts. (My school is not very specific about what the process is).
Apparently ‘some schools prefer you get an official transcript from both schools’. So if I do that, how do I go about requesting it? does my old school need to send the transcript through mail? or online? and do they have to send it to every individual college that I am applying to?
Since I just transferred to this online school this year does that mean I don’t have to request a transcript at all and just get my mid-year report?

Contact your old high school, and ask them whether they prefer to mail the transcripts to each college/university on your list, or if they will submit it online.

You can ask your current school what their practice is for students like yourself. They may send partial transcripts now, and then update them with the mid-year report later.