[bkrygier]

After reading some of the advice given, one thing you should know.
If you start with a certain amount of pressure an Know how much GPM your pump will supply if on a well, everything you do after that, adding pipe, valves and sprinkler heads, you will keep losing pressure. Going down in pipe size will not increase pressure, you will lose pressure. Designing a system from a well is a lot different than city water. My advice is to get a contractor who will work with you as a homeowner as a do it yourself project.