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There are LED calculators for online and offline use, a site that can calculate the values for you is below. If you have access to a smartphone you can also download an LED calculator that makes calculating a current limiting resistor a breeze. Hope this helps out!

http://ledcalc.com/#calc

I've run a couple of calculations through the site. Connecting them in parallel may work against you, if you can break the LEDs into groups of 2 LEDs you can extend the runtime of your 9v battery by quite a bit. I've included the diagram the site created below, you can visit the site and try other combinations if you wish.