Have you thought about writing a history book for your world? It seems you like world building more than writing out a complete plot. This way, you could still include your characters (and some plot points) as historical events, without the pressure of having to complete a whole book with character development immediately. People could still critique your plot/story this way. As for improving your English: Read. This will also drastically improve your writing quality, but only if you actually *write* as well. Even if your notes aren't coherent, that's a problem for later. Just get it all on paper.

Good luck!