i’ve answered this before on my personal blog, so i’m just going to copy paste what i put there:
unless it’s a daily/journal comic, write it first. get as much writing out of the way as possible before you start. it’s inevitable that things will change as you work, but it’s much easier to successfully make a comic when you have at least 90% of the writing done beforehand (unless it’s a type of comic without a real cohesive storyline or you’re some kind of weird genius or something).
after that, start making it. keep making it. and then don’t stop. ever. build up a buffer (at least one or two weeks worth of updates, more is better) before you post anything, regardless of what kind of comic you are making.
keep. going. don’t stop, don’t decide that you want to start the whole thing over again. it’s inevitable that your art will change, that your storytelling will change, that you’ll regret decisions you made in the past. that’s life. in my opinion it’s better to just keep going for as long as you can.
in addition to that, if you’re new to comics entirely i would suggest buying scott mccloud’s “making comics” and inhaling all the info in there. as far as i know, it is the best source of information on comic creation.
i’d also just suggest inhaling as many awesome comics as you can (asterios polyp is a personal favorite) and taking inspiration from those. but honestly, most of the things you’re going to learn about making comics will come from experience.
inspiration comes from outside sources and you can often gain tips and ideas, but actual learning doesn’t happen until you apply those ideas with your own hands.