Editing

Hi Everyone...

I'm a relatively new writer and learning something new each day.   I use a spell checker and will often set a finished story down for a few days (or longer) to review it for type-"O's".   Problem is I never seem to catch it all. Always mistakes of one sort or another.   I hate it.   I really do and my question....

Anything out there free or otherwise that can catch the basics?   An editor of any sort?   Even something crude would be helpful.   I have used an editor (person) and they've helped but have not found anyone to stick with me.  

Any advise or information would be appreciated.

Hugs

Mary Beth