Yep, exactly as Mike said above, keep offering crickets during that 5-10 minute period till your little guy stops showing interest in the crickets.
I find the best way to feed is about an hour after his lights come up in the morning than again around 4-5pm in the afternoon, leaving a good 3-3 hours before lights out. Lights should be on about 12-14 hours, so feeding at say, 8am in the morning (with lights set to turn on at 7am) and again feeding at 5pm, and having the lights go off at 8pm would give him 13 hours of daylight. It is best to buy a simple indoor timer (go with the heavy duty ones, that have the three prong outlets on them). Plug a power bar to the timer and your UVB bulb and basking light to the power bar I find works best.
During the day between feedings, have a bowl of finely chopped greens left in the tank for your dragon to nibble on. Though at a young age, dragons tend to ignore greens in favor of crickets. Also make sure any uneaten crickets are removed from the cage at night (or leave the greens in the cage over night so the crickets will eat that instead of your dragon). To keep crickets from escaping and hiding in the cage, I find it is best to just drop them into a small ceramic bowl from either a bag or other container the crickets are in.
To dust crickets, what I typically do is put a pinch or two of calcium powder and multivitamin into a sandwich bag, then dump crickets into the bag (holding the bag over the cricket bin so any that miss the bag, it falls back into the cricket bin). using egg cartons for the crickets to hide in works great, as you can break them into small sections and dump what crickets are in it, into the bag, then toss the carton back into the cricket bin.
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PHLdyPayne