I watched a Thinking Critical video on youtube yesterday and came across this comment from @janbaer3241:

How does one start publishing? I have 17 issues completed and stored on computer, all set up for printing, three more scripted, and source material for 100 issues.

I responded to the comment but either Youtube or Wes from Thinking Critical deleted my comment. Still the answer I gave might be helpful to some, so I am going to repost it here.

The easiest way to get your comic book out there for cheap, especially if it is already complete, is to publish it through either Amazon Kindle Direct Publishing or Lulu Publishing. There are no upfront costs and both Amazon and Lulu will handle the distribution of any paperbacks. They will also put your comic on their storefronts. Both Amazon and Lulu do take a small percentage of your sales when you sell through their respective stores. You will also need to format your comic to their template (which you can download for free with both Kindle Direct and Lulu). The average comic book size is 7 X 10 inches. Amazon can do color, Lulu… I’m not entirely sure and may only be able to do black and white. Once you publish your comic, Amazon does provide a book link for your comic, Lulu does not. For Lulu you just copy the long link of your Lulu product page and then use a link shortener like btty to get your link out to any potential customers.

Alternatively, you can compile your comic or graphic novel into a pdf, and then sell a digital copy on a site like payhip. Again no upfront costs if you do that, but payhip will take a small percentage if your make any sales on the payhip storefront.

The biggest problem you are going to have (and this is something all self-published authors and creators face) is getting eye balls on your stuff. But I hope that helps and good luck.

Here is a link from reddit that goes into a little more detail about creating a comic using Amazon Kindle Direct Publish: https://www.reddit.com/r/ComicBookCollabs/comments/kprac3/is_amazon_a_good_place_to_self_publish_a_graphic/

User krumble probably has the most useful comment.