By all means contact a forester. Had a neighbor with about 15 acres of woods sell off the larger trees, and he had a few giants, but all hardwoods. He called a saw mill and they low balled him terribly. He ended up with about $25.00 a tree. Now granted some woods are barely worth cutting and others are valuable. And prices for some woods are way down. Three months ago, a local saw mill was cutting black walnut for skids. A few professional turners I know, tell me they can't sell anything made of black walnut. One local sawyer told me he has a high demand for wide eastern red cedar planks at a really high rate, but can't find the trees. I had two paulownia trees at the south end of the property, and somebody "rustled" one last winter. Found where they backed a trailer up off an old dirt road and did not bother any of the other larger cherries or locust trees nearby.
Not all trees are valuable to lumber mills. What burls bring is mind boggling and some trees shunned by regular mills are worth much more as blocks of wood to hobbyists. Right now holly turning blocks are running about $20.00 a board foot. A few other woods are also outrageous. An arborist that hunts my property has an outrageous offer for any fair size osage orange he comes across. Seems nearly all the Osage orange trees in the area have been cut down over the past 20 years and no one is replanting them. Linden is another wood that is bringing huge amounts in the hobby market. ebay sales prices of Linden carving blocks are running about $18 a board foot air dried and $24 for kiln dried.
What your stand is worth depends too much on what trees you have and knowing where best to market them.