I found a nice tutorial on how to get to the Mun, especially with when to make the burn to get to Mun. The key is to get into a circular parking orbit at ~100,000 m (heading 90, of course). Initiate the escape burn right when you see Munrise and raise the apogee to ~12,000,000 m. Guaranteed to get you to the Mun (though you\'ll still have to do a deceleration burn after you get to the Mun).