There are tons of do-it-yourself landscaping books out there on the market. There are also thousands of landscaping websites that you can look at. Some are well done while others are not. Like Kirk said I'd check with your local community college or extension unit for courses. You will learn what works in your climate the best and what pitfalls to stay away from.
Another source are your local nurseries as they stock plants that sell well and do well in an area. One thing that really gets me is when a landscape architect specs out particular plants and then you can't get them through the suppliers because they've shown to be finicky in a particular area.