Hall24 - A great resource for information on home theater speaker placement is found on Dolby's website. Goto www.dolby.com and look under the "Consumer" section called "Home Theater". It's a veritable goldmine of practical information on surround sound for someone new to home theater.
Also, Matt Polk has very helpful info on how to properly hookup and place subwoofers on his website (even if you use a different brand of sub) and explains very well the pros/cons of the different hookup options as most subs can be wired more than one way into your system. Goto www.polkaudio.com and click on "audio education", then "home audio", then "subwoofer".
Last but not least, Crutchfield publishes a handy little booklet called "The Cruchfield Guide to Home Theater" which is free with any purchase or can be ordered for a couple of bucks by itself. (www.crutchfield.com) Please don't laugh, seasoned Audiogoners, I recently re-read my copy after being into home theater for several years and gaining lots of hands-on experience and the info in that little book is still very relevant and accurate. A great primer for someone new to home theater and surround sound.
Good luck with your system!
JZ