Best tip is to use fresh beans, ground straight before your shot. Which is very likely as you're using a hand grinder. Also, use the double shot basket, forget the single. You are going to have to experiment with dose weight as well. I don't know what sort of dose your machine needs. But if you have a set of scales that are accurate to 0.1g that will help with your dosing. Search for the 5c test regarding dose weight. Regarding setting the grind, you'll want to get the dose right first, then pick a grind position. Time the shot, you're looking for a 60ml shot in about 25-30 seconds. If the shot is faster, make the grind finer.
Personally, i would stay away from the opv until you are comfortable with the machine.
Hope that helps!