Need some tips on making edibles.

So 4/20 is next weekend and I figured it would be a great time to try making edibles for the first time. A friend of mine told me about firecrackers, and I think they'd make an OK fallback, but I really want to try cookies or brownies. Does anyone have a good recipe for weed butter? How much shake do I need? What's the process? Any tips or tricks would be greatly appreciated!