For anyone who writes (and these days who doesn't?) I highly recommend the classic "Elements of Style" by William Strunk. If you only read one book about writing this should be it.
Btw, I think it's more efficent to first write a "braindump" and then start editing, rather than reiterating a sentence a time. You'll remove and rework a lot of what you write but it's easier to get in the flow and just "get things done" before you start rewriting it.