DIY - Reflector Questions

Hey guys.

Does anyone know of a guide a DIY amature light designer can use to match specific LEDs with the proper reflectors ? This is one area I have a hard time with. I know there are many questions when it comes to texture, depth, Throw/Flood, LED type, etc...

I would like to start using high power LEDS in my projects but the whole reflector thing throws me off. It seems silly and expensive to just go buy a bunch of different types and try each one until the desired effect is realized.

Any reflector info. and guideance would be appreciated. Don't know where to start.

Thanks,
Bud