After you find a book you really like, you can head down to the bookstore and purchase a copy for yourself. Local newspapers also have columns on gardening that can help you determine when you should be doing what. It's fine if someone 100 miles to the north needs to put in peas now, but you need to know when you have to do it. I've also found useful information about invasive plants and which indigenous locals to use instead. This is important if we are to preserve our wilderness.
Invasive species can overrun an area quickly.
Local gardening columns can also help you determine which plants and which varieties can work well for you. Some of these columns are better than others, so if something doesn't sound right, don't hesitate to ignore the advice or find more information. Another good local source is your local gardening club. Some of these people have been growing plants for more years than I've been alive. We meet monthly to hear a talk about a plant related subject.