Pleas watch my video in the video section to see step by step instructions.  Here are some pointers.

Try to drain all the water from the meat.
Drain all water from yogurt, in the video I show a simple trick to do that
Dont be alarmed if after 20 minutes of baking your dish still has a lot of water
Try using fresh ginger and garlic paste
Check out my video on how to make Garam Masala
Roasted chick peas ( chana) are available in any Indian Grocery store