There are a couple of good short articles of home theater basics here and here.
The usual bullet-points are trumpeted: Pay attention to speaker placement, use precision sound-balance with the speakers, set your TV to the best image quality, and make sure lighting does not reflect off the TV screen.
Pretty cursory, but I guess those are good, if obvious, tips. The most important suggestion that Yours Truly can proffer on the matter is "Have lots and lots of money."