If I remember correctly, OF has dolomite lime in it. YOu shouldn't have to pH your water unless it's really horrible out of the tap.
Water until you get some drainage out of the bottom.
I wouldn't use nutes yet. At least let them acclimate to the soil before you blast them. Remember, just because you don't see nute burn doesn't mean it's not negatively affecting growth rate, among other things. Moar is not better. Just right is better... it's not like eating - shoving more down your plant's throat will not make it fatter. It will make it ill.
I think I'm going to start a thread called this: "For new growers and old growers alike: cut your favorite mix with 1/3 perlite and say goodbye to overwatering forever". seriously, it is really hard to overwater with well-draining mix, and much faster to correct nutrient issues, especially overfertilization.