If you dont already compost, what you'll need is a way to collect all the stuff you'd normally throw in the thrash. You could build a system similar to the happy farmer composter which I first heard about on treehugger no less!
You could build a bucket similar to the Happy Farmer design, however its hard to beat the purpose made off-the-shelf handiness of the design. Dealing with kitchen waste is not a pretty job, and getting the 'juice' (detailed later) is a hair's width short of requiring a hazmat suit.
Ok, on to the good stuff....
Step 1: Kitchen Waste, storage
There are various takes on this, and frankly... as far as I'm concerned, If its not paper, plastic, metal or glass... it probably belongs in the composter.
We started with a pint sized container beside the sink for ease-of-use in the first leg of the process.
When the kitchen top container get full, throw its contents in to the Happy farmer bucket and sprinkle on some Bokashi. You dont need to use the bio fermenting aid but it pretty much doubles the juice output of the bucket. There's instructions on happy farmer's site about making your own additive.