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Led Flashlight Help Requested

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Hi, I'm fairly inexperienced when it comes to electricity and circuits, so I could really use your help! :)

I want to make an LED flashlight. I plan on having around 5-15 LEDs connected in series, around 4-12 AA (1.2 volt rechargable NiMH) batteries in the flashlight, and some sort of resistor or voltage regulator.

Currently I'm looking at using this LED, are there others I should use?
10mm Ultra-High Brightness White LED - RadioShack.com

Is there a good way of calculating how many batteries I need for a certain amount of LED's? Also, how can I calculate what type of resistor(s) I'm going to need?
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