Those of you who have my book Gardening: An Ecological Approach know that I favor 3' x 6' garden beds for many garden plants. Reproduced below is an article from Catalyst magazine, April 2011, and an additional illustration from my book.
Now is a good time to be building these beds so that they may be installed as soon as the garden soil can be worked this Spring.
Here's a larger version of the 3' by 6' bed schematic, also found on page 168 of Gardening: An Ecological Approach.