You can get PMK developing times from www.digitaltruth.com. There is only one PMK formula, created by--you guessed it--Gordon Hutchings. Most medium speed films take around 9-11 minutes to develop, while faster films are more like 12-15.(posted 8508 days ago)To use PMK, add 10ml of solution A and 20ml of solution B to 1000ml of water, or divide by 2 for half the amount, etc. Hutchings recommends you agitate with two quick inversions every 15 seconds, but others report good results using 30 second intervals. Save your developer.
Use a water stop bath (acid will inhibit pyro's staining action) and a non-hardening fixer. Follow the fix with a two minute bath in your used developer to intensify stain, and wash--without using hypo clearing agent--for 20-30 minutes.
There. That should get you started. And, yes, I think PMK is worth the trouble. One film that generally gives good staining is Ilford FP4+. In 120 size, Kodak's Verichrome Pan can't be beat, IMHO.