Shaggy Sheep Driver mentions 50% RPM after start, if your starting from cold this is a little too high. 38%-41% is recommended during start with a gentle initial increase to 41%-45%, then when the oil temp needle starts to rise set 44%-48%. So in a nutshell you shouldn't set more than 45% till your oil is warming up. I know this sounds like I'm being picky, but it's cheaper than damaging engine components.
Try the SkyTrace website for procedures regarding the M14. It's largely aimed at Yak 52 owners though.