First comic?
Just have fun, no preparation, don´t think / don´t overthink, just draw those pages.
For maximum improvement:
Draw some pages, show it to pros who´s style you admire. Let them give you feedback.
A lot of professional artists are very nice and will give you free advice.
This feedback is gold and makes you improve more than every book you read or every
tutorial you take, it´s better than hours of training and trying to figure out stuff for yourself.
Most people are scared to do this but it´s a mistake. The pros are doing that what you
want to learn, ask them how they do it.
You think someone draws fantastic backgrounds and your backgrounds look like shit? Ask them how they do it.
The same goes for everything else. Dynamic figures, how to draw hair, whatever you can imagine. Ask the people
who do it. Don´t be scared of feedback. Don´t ask strangers on facebook, you will get wrong advice from amateurs