A good way to set pacing for a comic is to have the entire story or at least a whole act/arc/chapter planned out or scripted before you start to storyboard pages.
This can help you break down how much to put on a page. My method is as follows:
Whole story outline >
at least 25% treatment (description only expansion of the script) >
Chapter script (in writing I split the treatment into pages and within each page are 1-2 "beats" (An action and reaction), each page is delineated>
Whole chapter story boards or thumbnails (to get high level composition down)>
Then just produce each page of the chapter.
To keep reader interest you need to have a beat of action in a page. That is have someone do or say something, and it gets a reaction from the world around them.
And for long stories you really have to do a lot of front end work to get long term success. In the end though as a hobby, the only goal is to finish it.
I do webcomics for a living, which explains my pace, but I see hobbies as the sort of thing you do for its own sake, not for some result or reaction from the outside world.
Having posted a single 'page' (I reformat to scrolling for Tapas), three times a week since January, I have seen steady growth because readers like consistency and its our responsibility to craft a reading habit in the audience with regular updates. Reliability is a big thing for webcomics.
So updating steadily at a pace you know you can sustain is the best way to go. If that's a slow pace then you can expect extremely slow results.
For storytelling I have a couple resources to start but the general gist is still what I said above, Know your story, write it out, then draw.
Cause webcomics are a marathon of marathons and you get better at running one of you start with smaller projects and finish them. Mini marathons before you try for a really long and hard one. I made a pair of 50 page one shot stories before I even considered attempting a really long story. Finishing projects boosts confidence like nothing else.
Look up all you can about the three act structure. Start there. What structure applies to the whole comic can apply to a single act, single chapter, and even a single page sometimes.
Books on Screenwriting help with comics cause they're not quite novels or plays or even film but film is the best place to start to write tight stories because comics require a lot of time and effort for drawing and its best that time is used precisely and effectively so you don't have to go backs and change things when you're already on the middle of a story.