First tip - DCC ready means that there is a socket fitted READY for a decoder to be plugged in instead of the blanking plug. The loco is NOT DCC until you fit a decoder (chip).
Second - you say old track - how old? If it is steel (grey to look at, and a magnet sticks to it, it will be more trouble than it is worth). More modern track is nickel-silver, and stays clean a lot longer. (With DCC clean track, wheels and pick-ups are essential).
Third - Open up your track clip, and make sure there is NO capacitor in there. The capacitor is for eliminating tv interference, and corrupts DCC data. There are pages of images and instructions on removing it on here.
Fourth - read, understand, read again, the thread Getting Started, including Track Extension Packs on the top of the General threads.
Then, when you are totally baffled, and have more questions, cme back and ask again!