Firstly, get yourself over to RaspberryPi.org and join the forum. Lots of information and very knowledgeable people there. Several of the original developers of the RPi are active members of the forum.
One particular topic to look at there is this one :
Raspberry Pi • View topic - Commented Config.txt. This topic covers the config.txt file that lives in the boot partition of the SD-card. This has settings information for video output, amongst other things.
No colour usually indicates a mismatch between the video format being output from the RPi and that being expected by the display. I.e. output is NTSC and TV is PAL or vice versa.
The other settings to play with are those for overscan.