Advice - remember that there are only two types of ground jumps - short hops and full jump. A short hop will always be the same height as well as the full jump. You can count on where your attack will land if you know the distance of your jumps well.
Practice your air attacks both jump heights. Which moves can use use of a short hop without ending in landing lag? Which moves can you use out of a full jump without ending in landing lag? Where do those moves hit when you use them in the air? Can you use a second air attack after using one off a full jump? How about after air dodges?
Get used to these things. Go into training and do a little aerobic exercise. Short-hop forward, turn around, short-hop forward, turn around, etc. Full jump an air-dodge, practice attacking out of that. Practice air attacks out of shield, even practice air dodges out of shield.
Full jumps are underrated. Don't try to always short hop. Full jumps often counter short hops if you time it right.
Once you are accustomed to the speed and distance of your jumps, you an more easily quantify where your air attacks will land. You can more or less count on certain attacks being there when you need them.