Here's the proportion of the paint to Mod Podge. You really don't need a whole lot. Just make sure it's mixed well.
There's not a whole lot to it! Just mix, then paint it on the glass however you'd like. Add as many coats as you want until the transparency of the color is where you want it. Just make sure to wait 5 or 10 minutes between painting each coat or else it'll get all gloppy on you.
I think this will be perfect to put candy corns in come Halloween. I'm pretty excited about it :)