Copy Editing for Readability, spelling, major grammar issues.

I'm editing the copy to a blog I wrote and need to be sure there are no major errors. Its a blog, not a formal document so I'd like to focus on

1. Readability
2. Spelling
3. Major Grammar issues
4. Any other mistakes you notice.

You must use track changes in MS Word for this as you edit, and please don't rely on the MS grammar tool, I can do that.

This is mostly for readability, to ensure it makes literal sense.