Welcome! If you're trying to avoid crowds, stay far away from WDW the week of July 4th. It's fun and there are tons of special things happening, but it's horrible for park touring. I've done it a few times. This year was awful. Just waiting for the parade was a test of patience that week. I agree that early June always seems less busy, but I also think that about late august. Otherwise, go when is convenient and get to the parks at rope drop. Plan your day by doing the big attractions early and you'll be fine. Don't forget a day, or 3, just to explore and relax at the Fort!