Just bought a used off craiglist kv-30hs420 for using it for my ps3 via hdmi and dreamcast via composite. Is there any guides or something to adjust things on it to make it look good? Thanks.....

The Avia Guide to Home Theater is a calibration dvd that many folks are using to adjust their televisions for maximum performance.
It is a well regarded dvd and is worth every penny, in my opinion.