Moooooorefood, you seem eager, ambitious, engaged, and intelligent enough to potentially do this. Most people start with a shared google drive or excel spreadsheet, but exactly how they set it up varies a lot person to person. You'll have to tinker with what works best for your approach, and there will be trial and error from which you learn a lot. If you're also doing form checks, have them trim the file - always - to the parts you want to see, and upload it (unlisted, if they prefer) to youtube, and send you the link. Much better than having the send actual files.
Beyond that, it's knowledge and experience, and the aforementioned trial and error. Make sure to read the articles on this site about becoming a coach, too.