Hello, Savg!
Probably the best thing is just not worrying about it and jumping in for the fun. Aces High is great. The hardest thing to get used to from the old AW days is actually the gunnery. You'll quickly get back up to speed with air-combat maneuvering, but there are no hit bubbles here, and gunnery seems pretty realistic, so it's harder than in AW. But, man, this is a great game. And there are scenarios from time to time as well (which is what I love the most).
Welcome aboard!