It just really needs a conclusion, I'm sure you can do that.
Also I think that you'll find after you do one story the next will be easier the next easier. Ask Toro about how he did his, I think he'll be able to give the best advice on it as he's just finished his.
Unfortunately I'm about as creative as a brick,when it comes to new characters, so I probably can't help with your story. You know your character best so you're the best person to write about him.
However saying that in a couple days I have a few days off so I might try my own story, using some of the mane six since they're fleshed out characters already and we all know how they act. It also seems to be the thing to do these days.

I just need to have an idea like Toro before I can start otherwise the story will be as bad as the one I wrote for university. (No it wasn't MLP related, the show wasn't on TV when I wrote this) The story I wrote for Uni had my own characters, but I feel that if I could write a fanfic it would have been much better.
I too also like the new ED layout, it's much cleaner. I think that having the wider main area makes it easier to read.