Observe as much as possible without letting it become a stumbling block. Active observation will let you notice evidence of water action even when it's dry.
This has been mentioned at least once, but do your earthworks first. In the same vein, do any disruptive installation of features that will make it easier to maintain your system, even if it's just roughing it into the landscape, or even just marking the features on the land with string and pegs. This includes semi-permanent to permanent boundaries, access paths or roads, and main buildings (ones requiring foundations, for instance).
Remember to stack functions wherever possible. Roads and paths are rain collectors, and appropriate water distribution and road design turns the washed-out road problem into increased rain irrigation.
Also, don't play Jenga with the stacking of functions. The point isn't to see how much responsibility you can pin on one moving part of your permacultural system, but to see how efficient you can make the system as a whole. Besides, what happens if you miscalculate and that piece fails? Remember the hugel-dam-swale-road, and the trip it took downhill to see the neighbours' house.
Remember that often problems of excess (too much water, shade, sun) are really just problems of too narrow a focus. Turn your waste into the feedstock of another process.
I have said it before in another
thread, but don't build your
greenhouse in the shade. I mean this literally, but figuratively as well.
If you have no direct sunlight, plant for the shade. If you have no shade, best to grow things that like full sun. If you don't intend to irrigate, make planting choices that work with that decision. If you choose to plant things that require support, don't skimp on the support.
Oh. And
compost. Compost everything you can. Start a worm bin. Encourage the conditions worms love in your soil, including appropriate organic matter and appropriate constant humidity. Healthy soil critters are the unsung heroes of the gardening world. They make things work so much better if you put them to work for you, which essentially means nurturing them so they can do their thing.
To that end, learn to make oxygenated compost extracts to put the soil life you want where you want it. While not exactly light reading,
this list of Dr. Redhawk's soil threads has so much information, usually conveyed in a straightforward manner, that even the noob will benefit greatly. Compost extracts are in there, but more importantly are discussions about how to look at soil, and the difference between soil and dirt, and dozens of other little things that have shaped the way that I look at soil.
Lastly, read and do, in that order. Read, because there's just so much to learn, and do, because learning will only do so much good.
-CK
A human being should be able to change a diaper, plan an invasion, butcher a hog, conn a ship, design a building, write a sonnet, balance accounts, build a wall, set a bone, comfort the dying, take orders, give orders, cooperate, act alone, solve equations, analyze a new problem, pitch manure, program a computer, cook a tasty meal, fight efficiently, die gallantly. Specialization is for insects.
-Robert A. Heinlein