How to properly cook a kid?
Older goat tends to have a very strong flavor, hence why many suggest braising in strong flavors. You can braise your kid following these recipes - just remember to use 3/4th the amount of strong seasonings as you would for a regular goat.

As for grilling the meat, you could try to marinate the meat overnight with herbs and spices. Unlike chicken, which is a fairly blank canvas taste-wise, goat has a strong taste (even kid meat has a slight gamey/goat-y flavor). As I said, if grilling, marinate. 

If you're braising or stewing, toss in a beer, some mint or basil and a few other herbs.

For the ribs - you could french them to get rid of some of the connective tissue and then marinate and roast them at low heat for a few hours to break down some of the connective tissue. 

Good luck and great eating!