To the OP, you want to make sure and understand the difference in wood values as many of them are "at the gate of the mill" vs stumpage which is what you have. There is a very large value disparity between the two. Not only that but often one price will be per ton and the other per 1000 board feet. (there's ways to convert that) Getting the trees down, cut to length, out of the woods, onto a truck and to the mill (however far that is away...) takes a big chunk of change. If you don't have the means to do that yourself, then all those processes are going to require you to pay someone to do that. Plus maybe a professional forester if you don't feel confident in tree cull selections.
That's why I mentioned "firewood". If you cut the trees into firewood, you can do the entire process yourself and any proceeds from sales will go directly into your pocket. It's a lot of work, takes a lot of time, but doesn't have to be done all at once and managing the mess is much easier since you'll be cutting up a lot of what would be left as slash in a logging operation. I guess get a couple quotes from some reputable companies and see what you could net. While the trees you have on your property may seem like a significant resource to you, in terms of logging, it's a molehill.