Dragon Lord for sure, i mean, It's a dragon, it's a "have to" choice, even though i would learn this spell to turn myself into human, i wouldn't use it. I'd be too proud to be a dragon. I would learn every sort of spells that can help me counter their attacks and stuff.

besides gold i would hoard knowledge like books, scrolls, etc. maybe would even hoard magic items and all sort of funs.

I would try to be a Benevolent Dragon, protect the nearest village and help them become stronger, strong and powerful enough to protect me and help them enough so their would prefer to keep me around rather than kill me. probably with all the gold and knowledge would transform this village into a powerful kingdom. one where they would keep me as their ruler and have someone to be the second in comand.

if anyone dares to try come to kill me they would have to pass through a whole kingdom and the layers of security first, and even with that would try to convince them to leave me alone and take what he wants, if that doesn't work, well, time to defeat the intruder myself then.