There’re a lot of resources out there. Various books, apps and websites (like the WWT's blog) can help you to boost your knowledge and ability to identify different birds. You can even train yourself to learn bird calls with audio resources.
Keep a record of what you’ve seen and when. Most birders like to keep a country life list and a year list. The latter will help you prep for the upcoming year. For instance, you might note down a green sandpiper in the second week of June one year, so you can start to know what to expect by the following June.
For nature fans, birdwatching is a really educational activity. On a longer term basis, you’ll be able to see how various factors affect bird migration. For instance, a warmer spring might see swallows returning earlier.