Grass strip help

[farmerbrake]

So my family has a dairy farm, and I have my pilots license. My question is what all requirements are there to put in a grass strip for our own private use?
Who would I need to get permission from?
What length/width suggestions do you recommend? Probably just a 172 or 182 for the plane, unless you have suggestions for a better grass strip plane for around 40,000
There is a class D towered airport about 10 to 13 miles away.
Any other advice/knowledge you care to share?
Thanks in advance!

 

[Jim Logajan]

The answer is location specific, so it would save much time to indicate the state and county where the strip would be located.

EDIT: I see by a previous post elsewhere you are in Pennsylvania. This appears to be the PA state code related to airports:

http://www.pacode.com/secure/data/067/chapter471/chap471toc.html