high speed wobble

I'm using 'Igniting your writing' curr (currclick.com $10). It is really good at breaking things down and getting kids engaged in their writing. Many good reviews on it from parents of kids who don't like to write and then love the lessons. They also have 3 levels of difficulty so you can use it w/mult. kids or at any age really.
I'd not worry about the spelling so much and concentrate on what is being written and at his age not even stress too much on punct. There are pleanty of prompts online too. Pictures that are story starters, if he enjoys reading have him write about a fav. book or character. Have him write about his fav b-day, vacation, pet, thing to do. If he's into bionicles, have him write a story about them. I used journaling for some short writing too. If we'd done anything fun or had a holiday, even upcoming events, ds would journal about it.