Well, mW figures, I'll put it like this:
6 mW of laser light is enough to leave a permanent damage on your eyes faster than your blink reflex will protect you.
You have around 250mW of laser power at your disposal. Treat it like a loaded gun.
It is good that you have your parents trust on your side, it's great that they trusts you
I started out the same way.
So, what else could you need... hmm
Well you need a housing to put that diode into, aixiz housing that is, here's one:
Aixiz 5.6mm Laser Diode Module
You will need ICs to make your drivers with:
20x AMS1117 LM1117 LD1117 ADJ 1A Voltage Regulator | eBay
^Five bucks, free shipping, twenty pieces
Gotta love Chinese bulk component distributors.
That's about it for the starters.
Take it easy with that diode. If you happen to destroy it, you can always get replacement ones:
HighTechDealZ - 650nm 20x DVD Burner LPC815 Sled
But take care of it. Patience is the key here.