Of course I'll take the elegant dress sense, because I want to be cute.
Taking Caelis Valera, the kingdom of magic, seems like a safe bet, because female magicians are probable better seen than female fighters.
I'll dump 20 shards into having my uncle really like me, because he's the king until I take over and being the king favorite niece is really a plus. This will also allow me to train in magic and thus be a ~magical girl~.
For the traits, I'll take charming, I want people to feel bad about letting my brother have his way with me. I also want to be cute. Being mature would probably be a better choice but this is my once in a lifetime option to be a qt little girl so I refuse to let it go!
For my education I'll go with Courtship behavior, music, stewardship and magic fundamentals
Courtship behavior and music seems like the things to know if you want to deal with nobility and the mage.
Stewsardship is a necessity to rule a country. Thanks to my lovely uncle I'll be very good at it :)
Magic fundamentals turns me into a mahou shoujo so it's nice. Also it'll give me the mages opinion and allow me to pic school of magic.
Since I'm in Caelis Valera, I take the clairvoyance advanced magic for free. Since I'm charming hopefully the archmages I didn't chose to teach me will still like me a lot.
I chose clairvoyance over a more martial one because this way men will feel less threatened, since I'll still leave them the fighting part. Also this magic will help me find proof of how sinful and rotten my brother is.
For advantage I'll take the ancient laws perk to ease the guilt of those helping me in my coup.
I'll also take Titus Caricus to be my strong onii-chan who handles the men when things get rough.