What should I write?

I'm not quite sure what to write. I have so many ideas I can't decide!
Here are some ideas I had for stories: the misadventures of Liechten Stein, (which is about a boy named Liechten Stein, who is chosen to help represent his country Switzerland in an alliance of all the countries when the world is being taken over by an evil vampire sorceress named Vendetta Desdemonda. He meets a girl named Brenna Remington and discovers he's her guardian angel and it's his job to protect her. There are tons of other crazy, funny zany, and pretty epic stuff that happens in it. Like when they meet the nutty, and just plain bizarre triplets Eins, Zwei, and Drei, the time when they are invited to a huge, fancy, party, when Brenna discovers her hidden powers, the time when Zwei invites Brenna over for tea, oh! And there's the time when Brenna and Liechten kiss!
It's basically a romance/comedy/adventure.
And then there's the story of Edgar Conan Parker called "When the claws come out." It's pretty sad and scary at times though. But it's pretty cool and has some of my favorite characters I've created in it.
Then I could try and post another chapter of How a little girl ruined my life and/or diary of a wimpy vampire.
Also there's one called "What a wonderful world," which is about the misadventures of a girl named Ceara. It's supposed to be funny, but most of the humor in it is sick humor. Ceara's an eigth-grader, she's very different from all the other girls, she's unusually kind, loves writing, reading, and painting, she's a lot like Lisa Simpson only older, also she has her own fan club but is completely unaware of it. There are tons of interesting characters in it, like the kindergarten teacher who's been pretty down on her luck with men, but ends up dating Death, the obnoxious boys at Ceara's school, Ceara's funny, wacky, friends, Leroy, a drunk who spends all his time in the pub, enjoys composing epic poems, also whenever people need advice on something they always got to Leroy. Ellie, a little girl who's always asking questions, and then there's Death, who has a British accent, loves his job as collecting people's souls, is kind of a cheapskate at times, loves drinking and making tea, loves reading classic novels and poetry, even though he has a girlfriend he's always admired Ceara and how she wasn't like all the other mortals, and always wears a black robe.
Here's some of the stuff that makes it sad, Ceara was suicidal when she was ten years old and recently got over it a couple months ago, and to sum it up it talks about all the sad and sick things in the world.
But there is some pretty funny stuff in it as well.
Like when they first meet death, and then there's the part where they go into the land of cartoons and one of the guys says "I told you Sponge bob was gay." and Ceara meets her favorite anime characters, when they go into dream world and Ceara realizes that Damian is madly in love with her, and there's just so much other stuff I can't think of it all right now.
Also there's some short stories I made up as well.
Let me know of you're interested in any of them!