Do some looking around on simply marketing the trees. Part of the deal could be some stock blanks. Those in the wood business can realize a tree's full potential and possibly generate more dollars for you. A friend back east (WVa) sold about 25 large standing trees. Had that money been mine, I would have retired about 5 years earlier.
If it's truly fine wood, look at 6 to 9 years of air drying time before getting out the chisels.
Edited: I reinforce that one should seek out others with experience. Unless one has a wealth of trees, his first efforts are going to be research into the unknown, and it will be hit or miss on potentially generating good products. Given the potential value of fine walnut, mistakes can leave one with nothing but pile of nice smelling kindling.
