There's really a few questions here all wrapped up together.
For starting a story, I recommend showing the primary draw of your comic as fast as possible, within the first page ideally and definitely in the first scene. Within the first 5 pages, the reader should be able to answer the following questions:
1. What kind of a person is the main character?
2. Why do I care?
3. Is this story likely to deliver on its promises?
Then, in your first story unit (chapter, arc, whatever), address the theme and main point of your story as if you won't get another chance.
The opening chapters of My Hero Academia, Naruto, and Dungeon Meshi are excellent examples.
For page turning hooks, there should be one on every page. There are some cheap ones, like having a character start to say something in the last panel and finish it on the first panel of the next page, or having a character ask a question in the last panel and answering it on the next page. You can do it with action, like winding up a punch but throwing it on the next page. The variations are endless. Again, Dungeon Meshi is really excellent at page-by-page hooks. I want a reader reading my comic to be like a person eating a great sandwich - yes, each page/bite is delicious and satisfying by itself - but that next bite is gonna be good, too! And then before you know it, you've eaten the whole thing.
In all cases, you're posing a question to the reader to which the only answer is to keep on reading, and not only with the big plot questions but also with each little moment to moment.
As far as cloud dashboards, I feel like Tapas has a decent enough dashboard for my purposes. Comments, likes, and so forth are a good-enough metric for reader reactions, short of having a camera track reader's faces as they read.