Depends on the person. I'm only going off of the few people I follow, but they make a post a few times a week with like a character (even just a sketch) to keep people posted on projects they are working on and the early access comic postings I think are 3 days early for my friend who does a gag comic (so his are weekly). If it's feasible, I'd recommend following a few people to see what they are doing, just to get a feel for it. People you wouldn't mind giving a dollar to, just to see how they're doing it.
But honestly, what helped me with starting a patreon (back when I did that) and opening a Ko fi was hearing an artist say "listen, it's not kickstarter, it's for people to support your work that you are already making" and that was the push I needed to just open the thing. There's no upfront cost. You can come up with incentives as you go. And like my patreon was just a tiny little bit--but it was better than nothing.
