I actually am strong and VERY flexible. But do you have any exercises that go specifically with these skills?
Yes: strength, flexibility, and handstands.
Sorry if you were hoping for something more exciting, but this is the reality of efficient training. If you want to be the best you can, the way to get there is by training efficiently and safely. I promise you every coach would rather teach their preferred techniques from scratch than have to un-teach bad habits learned at home. And both an aerial and a ROBHS are very technical and in some ways unintuitive skills; the odds of you teaching yourself the right technique at home without a coach are very very low.
But if you want to get the most bang for your buck, both in the gym and out, want to get these skills and more, you can help yourself get there by doing conditioning, flexibility, and handstands at home.
Flexibility, I'll grant you, there's a point where your flexibility is "good enough" and you don't really need to push past it. However, there is no such thing as being too strong, or having too perfect a handstand.
ROBHS uses pretty much your entire body. Arm and shoulder strength for an efficient spring off the hands. Lower body strength for an effective takeoff. Core strength for efficient snaps in both the first and second half of the BHS. Etc, etc, etc. Your coach should be the one to teach you a BHS, but you'll make it easier for them if you have good strength and a strong handstand.
So I'm sorry if this wasn't the answer you were hoping for, but if you want to learn an aerial and a ROBHS, the best thing you can do at home is stretching, strength, and handstands.