Honestly, I'm not sure that this would be the best place to get this kind of work done, nor would it be the most cost efficient idea to have it done vs. do it yourself.
1. I'm not sure if commissions is something that's allowed per the website rules and regulations, you'd have to look into that.
Now for the cost efficiency part.
1. Most of Davo's stuff cost between $15 to $30. Some of them only include the actual devices and not and environment. So there's that.
1.1 What if you want a different environment? Or want something that would require multiple props to be "merged" in a way? That would cost more time and money to the artist
2. Then, let's say that you want a certain character body type, hair style (with color), maybe some scars or blemishes, tattoos, stuff like that. Most of these things have to be bought from the Daz website, Renderosity, or here (just to name a few) and can cost anywhere from $10 to $25 based on whether or not it's on sale, if it's in bundle, so forth.
3. Next, you've got putting it all together in a cohesive manner that you want. The artist has to go based off of whatever you've told them and create your art. This, based on how thorough the artist is, could take days/weeks. Between angles, lighting, shading, posing and gathering the proper props, it can be seriously time consuming. They're doing all this work on the side of their normal everyday stuff (unless working on 3d art is all they do) Then you're talking about making animations out of it, which would take even longer to put together. You'd have to make sure the props don't bug out during animation, make sure it looks "natural" and not like some old PS2 game, etc.
4. Following that, you've got render times. This artist could be really strong with all the aforementioned elements, but if they're computer isn't top notch Best Buy standards (even if it is) it could take between 30 min to multiple hours of rending each image. Animations would take the most time, because it's all based on how long you want your animation to be, the speed etc.
4.1 A very general idea of animation gather from a Youtube tutorial: If your animation was 10 - 20 seconds long, and you want to run it at 60 FPS (frames per second) which is really high quality/smooth for 3d design and gaming, that would be 600 - 1,200 rendered images all compressed together to make your animation. Now take my earlier example of it take 30+ min to render just one image. Making a 10 second animation, with the parameters that I just set out, would take 18k minutes or 300 hours or 12.5 days of just rendering. Again, this is just a very general idea, but you get the point.
5. Lastly, there's post work. I personally am still practicing when it comes to post work, so I'm not sure what all can be done with it, but I've seen enough Youtube videos to know, it's a lot that can be done. This one, like the others is up in the air, since it's based on what program they use, what you're asking to be done, how tedious that process is, you get the idea.
Based on this general outlook, you can imagine how someone could charge you anywhere from $3 - $7 per single image, and possibly $15+ for an animation that's less than a minute. While you did make a point that you're not tech savvy when it comes to the 3d programs and how to make them work, I can tell you that Daz3d is a very user friendly interface. The community of people who use it is massive and growing. It might take you a couple of months if not years to really get it down, but it's a lot more rewarding (in my opinion) to be able to make exactly what you want yourself than to wait on a third party that you're not entirely sure of make it for you, then have to pay an arm and a leg for it (even if they are reasonably pricing it)
Not trying to deter you or anything, just being realistic .