How much does it usually cost to put up a 6 ft wood privacy fence? Per foot or yard - an average price.?

Answer 1

Check out the prices in the ads of a home improvement store.
The fence sections will come in 8ft lengths and you will need a 8ft 4X4 timber for each section plus 1 more. Plus you can figure on one bag of concrete for every two posts to anchor them solidly into the ground.
As you will notice, there is a wide variety in the prices depending on the quality of the fence section desired.
There are other items required like hinges, if you want to put in a gate.
If you have the work done, at least now you will know what the materials will cost and then you can figure out how much they will charge for labor.

Answer 2

You can go to Lowes and buy a wooden 6'x8' panel for under $30. So, however many 8' panels you would need (plus you have to pay for your posts, bag of cement like quikcrete to stabilize each post and probably some nails) multiplied by $30.