Theory of garden arrangement?

I'm interested in arranging our garden and would like to know where to find a simple book or online guide to design perennial flower beds, shrubs etc in an aesthetically pleasing manner. I have a good artistic eye for design but am new to the gardening gig and would obviously also need a few tips on which perennial flowers go best together,
Theory of garden arrangement?

FlowersBirthday FlowersSympathy Flowersallan armitage has good books on perennials
Reply:You can get lots of tips and ideas from this sitecomputer