http://aquariumadvice.com/viewreview.php?review=13
Helen Nash, The Complete Pond Builder.
Tom,
This is the best book I've ever seen on building ponds. Considering it is a couple hundred pages, we could never duplicate all the ideas and techniques here on this board (not to mention copyright infringment). The info I got from this book was invaluable, and the pictures were even more helpful, as I am very visually oriented.
I highly suggest you either buy it, or check it out from your local library.
Considering it is the dead of winter, this is the prime time to do research on what you'll want to do when spring arrives.
I'm really glad you are interested in getting into ponding, but you need a good deal of background before we can help much. I researched for a long time before purchasing any supplies to build my pond, or before I even touched a shovel.
Setting up a pond requires more research than most, if not all, aquarium set ups. If you mess up a hole in the ground, fixing it is more trouble than you can imagine.
None of us mean to be rude or anything, but please get some background first, then come back with more specific questions.
Good Luck!