Firstly, birds will be attracted by the geographic location of your garden.
To find out which birds are in the geographic area of your garden at the moment, you will have to consult specialty magazines and documentations. Maybe even the weather guy can provide some information regarding this aspect although this is not always true. Libraries and book stores have books based on migration, on the roads that some bird species take to get to their summer or winter residence. Also, taking pictures of birds you see around you and then reading informative materials that you already have, or searching for information related to them can be an option to find out if these bird are going to make a stop in the area that you live in.