Find the thread titled "sod bid urgent request". There you will find my thoughts (as well as some other people's) on pricing per square foot. You need to give a lot more info than what you have asked too.

If you are wanting mowing stuff, you probably would have better luck on the mowing forum.
It seems we have been getting a lot of people asking about this here lately. Perhaps I should start a thread on why not to do it this way....
I see you are new, so do some searches using the search feature. Most likely a lot of what you have questions on has already been asked. If you don't find the answers you are looking for, ask away!
Dan