PHP, Facebook & Other various animals

The new site is up & running and I'm doing my best to redirect old CF based site traffic to the new PHP. It's only been 10 years since I've touched a redirect file - and 2 years since I've done any web dev. And my brain has been fried for the most part since 2004. So I suppose you could say I'm not having a good time at this point...

I've become addicted to Facebook! It's the first & last thing I do online each day at this point...anyone know where I can find a meeting? ;-) LMAO

Okay, all BS aside...I need some help rewriting the .htaccess file and any SEO tips for keeping our rankings before the bottom falls out. The new site generates HTML files for every category, sub-cat and product so I think our rank will jump at some point. But for now I want to keep us afloat with as little damage possible.