Answer: Congratulations on your new garden! I think you're on the right track in your quest to identify the plants in your new landscape. It's easiest to identify plants by their flowers so as each bursts into bloom you can either visit local nurseries to find similar plants or you can take a flower sample and ask the nursery staff to help you identify it. Roses will be your biggest challenge - there are literally hundreds of them! The American Rose Society (ars.org) has a website with roses categorized first by flower color and then by growth habit so it's one place to start. There might also be a local garden club that specializes in roses so that might be another resource for you. A final suggestion is to check the wealth of information contained in your local library. You'll find shelves of books on roses, many with color photos to help you identify what is in your garden.
Best wishes with your new landscape!
Q&A Library Searching Tips