You want something like one of these...
http://www.sprinklerwarehouse.com/Drip-Irrigation-Kits-s/2793.htm for your low-flow valve, filter, and pressure regulator.
From there, run PVC underground to where you want to use drip irrigation. The thing I did to protect pipes from weed-wackers, I used copper to transition from PVC underground to above ground pipes. I would use a street elbow to keep the copper low to the ground, and terminate at a 1/2" copper female. Then you just need something to transition from female standard pipe threads to the 1/2" drip line. And if you ever tear up any of the drip stuff, worst case you rip it all out back to the copper and start over from there.