Hey Greg, A great start is Gaia's Garden by Toby Hemenway. You can also watch some free videos by Geoff Lawton on youtube or his website. A lot will depend on your location/climate and your goals. If you share that, I'm sure people could help you out even more.
He was giving me directions and I was powerless to resist. I cannot resist this tiny ad:
permaculture bootcamp - learn permaculture through a little hard work