I see 2 different approaches
First is to sell the wood in log form, as is, to lumber mills.
There they can break the logs into boards and planks, kiln dry them, stack and store them for sale.
OR, if you decide to become a lumber mill, there will be a large investment in machinery, warehouses, driers, sales staff, etc.
Most woodworkers don't have the machinery to mill logs into lumber. The logs are long, very heavy and require forklifts and band mills to saw them into useable boards and planks. I've done a little bandmill work here on my own land with my own logs, and it's fun but a lot of work. My friend's have a Woodmiser LT 40 and it's a great bandmill, but for occasional use it's not worth it for me to own one.
The answer to your question will only be as detailed and specific as the question is detailed and specific. Good questions also include a sketch or a photo that illustrates your issue. (:< D)