I have noticed that quite a few new, young writers tend to be impatient with themselves and their creative process, which causes them to ask questions of the "experts" on this forum which they really should be asking themselves. Quite frankly, answering your questions here would be doing you a terrible disservice on multiple levels.
First, you will never learn the joy of creating if you outsource your creation. Writing is hard work, but what sustains you through that hard work is the joy of creating a new world with new people doing new things. Should we take that joy from you?
Second, if others create it for you, you will never own it. That isn't to say that you won't have copyright or anything like that, but it will never feel like your own story if it is made by others. You won't fall in love with your characters because they aren't your children.
Third, you will never prove to yourself that you can do it for yourself. Asking all these detailed questions about characterization and such will never build your confidence, but will only build a codependence on the approval of others. You don't need me or anyone else approving your ideas; all you need is your own satisfaction in them. This is true across the board, not just in writing; the more you depend on others to do what you could do for yourself, the less confidence you have to do anything.
Fourth, if we were to hold your hand through designing characters and storyline, suppose you wrote the story and it became a best seller. Then what? Others will want you to write more, and you will not have the tools to do it, because you never learned how to create for yourself. You will either have to come back to us to help you create another story, or you will go at it yourself and not be ready, because your wastebasket will not be full enough of ideas you rejected as you were creating. What you need is to learn the tools of the trade so you can create. And, just in case a certain someone is lurking about (long term members will know who I am talking about), those tools are not stock storylines, characters, or a model of plot development. They are hard earned editing skills, experience in creating, the voice of your protagonist and narrator, skilled use of POV, and support sites like this and TV Tropes, which when used properly can be of immeasurable help. This site is best used, in my opinion, for the critiques and the writing challenges. The former gives you the opportunity to discover weaknesses in your writing to improve upon while you are editing. The latter gives you raw experience which cannot be substituted. It looks like you already posted in the December writing challenge, so good for you in doing so. After the challenge is over, I would encourage you to put it in the improving thread so you can get feedback.
So all this to say, we care too much about your development as a writer to do your work for you. Or, at least I do, and I suspect most here do as well. There may be some who give you what you are asking to your developmental and perhaps financial harm, and I am hoping to give you the framework to avoid that particular trap.
You'll get there. Just be patient with yourself and keep writing.