Congrats on the new beardie! He should be eating as much as he will eat in 10-15 minutes, 3x a day. That should equal to about 50-100+ crickets a day, I know that may seem like a lot but baby-juvie dragons eat a LOT! I would also try different greens, kale is a "feed occasionally" food, so it shouldn't be fed as a staple diet.
Here is a link to a great list of good and bad greens and vegetables:
http://www.beautifuldragons.503xtrem...Nutrition.html
Also, here is a great caresheet and FAQ page that will help you make the best life for your new dragon!
http://www.diamond-gems.com/caresheets.htm
http://www.diamond-gems.com/faq.htm
Good luck!