Really anxious about what to keep track of...

Hello everyone!

I just recently became a part of the fleet, and I am confused as to what exactly I should be logging. I read ZiL's ultimate tax post, and I am now really anxious about taxes and Postmates. Should I JUST be logging miles driven for Postmates? I do a 46 min (45.8 mi) drive into Indianapolis when I want to do deliveries for Postmates--should I be logging that? I got the Everlance app to help log my miles, but is that enough?

Regarding taxes, as I understand them, I need to file THREE forms ...1040, Schedule C, and Schedule SE...is that right?

How much percentage of the money I make through Postmates do you think will go to taxes? ...It's starting to seem like a great hassle just doing deliveries!

Thank you for any help!