I agree with Yoder, after you install a fill in the house, you should be good. Like he said, alternate closing feed return valves and it should work. I never had to worry about the boiler, it seems that all the air goes out the overflow tank. Actually, when I fill mine, eventually water will to come out the overflow fitting (black 90 on boiler) especially when it's coming up to temp from expansion, then it finds it's "level" onm it's own. I do have black lines for hi and low levels on site tube.
Let us know how you make out.