Automatic MORE/NEXT PAGE tag for long posts

Hey guys,

I want/looking for a plug-in or something that will automatically add a ‘MORE’ tag to a post if it doesn’t already have one.

Ideally, I’d like to have the option to do a MORE after about 150 words and if the post is more then say 750 words, it would do a ‘next page’ type thing.

I’m not an expert on WP, but any help you could offer would be appreciated.

Thanks in advance and I appreciate it…

LHenry