Looks like you're asking two questions.
One is about drawing and the other seems to be aimed at STARTING YOUR [first] COMIC (SERIES).
-
Please don't be like 92% of the internet and start sharing EVERYTHING you create.
Please don't.
When should you start drawing? Yesterday.
When should you start making a comic? Yesterday.
When should you start uploading pages and actually start (sharing) this series?
When you can demonstrate a handle of the basics.
When you've learned you don't need to reinvent the wheel.
When you've read and studied enough (classic & popular) comics to recognize the good from the bad.
When you've done a demo of everything and made CHOICES about your style.
Like, figured out your word balloon system.
--Chosen some proper and fitting fonts.
----- Have shown your close circle (not random people on the internet(s) your work and they can follow it....
If this comic idea is some kind of sweeping long saga, don't do it first.
Make some short stuff as a learning experience.
Get a handle on making a comic --
And then you can know how long everything takes and what it takes to make a comic series.
DO NOT LEAD with your best idea first.
-
That will avoid the same 10 problems all creatives face when they don't plan and leap into the fire.