Well, my suggestion would be to go with what you know. When I take commissions, admittedly I don't like to go too far out of my comfort zone because I can't assure the quality of something I have never done before.

Looking at your gallery I do see a few interesting types of things-sheets with multiple drawings/characters on them, scenes, simple drawings of a single characters. Given your style, I can see something like this one being pretty attractive: https://www.weasyl.com/submission/78944/winter-2012-drawings-3-1-burden-present-day-sibyl
It's got a full-body picture, a couple waist-ups and a bust. Good diversity, interesting poses, has a really neat look to it in my opinion.

Pricing is something I can offer some rather unhelpful and painfully obvious advice on, when I do commission work I have set prices and they are probably a bit on the low side even for my rather mediocre skill level. I guess you'd need to figure out a per-character pricing model (including busts, waist-up, three-quarter and full-body) for things like your sheets with multiple drawings, letting the client pick what they can afford (say, a sheet with four busts or two busts and a full-body pic). Then figure out how to charge for complex props/items (I tend to count something like a car as another character due to the complexity, but something simple like a chair I wouldn't charge for).

When it comes to actual numbers to charge, though, I have no idea. My main source of commissions is a single client, and I base my pricing on what he was willing to pay for various things so it works well enough. (Woo, textwall, sorry.)

What about reference sheets and other character design? I like what you did in pieces like:
https://www.weasyl.com/submission/78953/winter-2012-drawings-4-2-polly-again
and
https://www.weasyl.com/submission/80559/winter-2012-drawings-6-moult

(Not like I could afford to commission anyone at the moment though, sorry. :C )

Limited budget, so probably just inks.

you could start with some simple little sketches to see how it goes! i wouldn't commit to anything too big if you're just starting up again.

that's really exciting, though, best of luck!

the most success I've had from commissions has been to contain them within a certain theme (mostly within the REZQ setting/universe, where clients would be buying a picture of their character doing some kind of depressing future space job). This both helps people to imagine their characters in the commission (and thus be more likely to want a commission) and helps me to stop commissions from massively overflowing my skill set. It also makes pricing simpler and allows me to have a consistent sense of how long a commission will take.

It's not quite a "Your Character Here" commission but it's providing an enabling constraint. I would say that in your case a good thing to do might be to take one of the larger projects you've done -- like that brilliant Burden comic you were working on, for instance -- and see if people might be interested in having their character rendered in that kind of a setting. Obviously if you've moved on artistically from that then think of something else but for me that has been, by far, the most effective approach to both attracting commissions, getting them done and having people really satisfied by the work (and coming back for more).