So far, I've only worked with creating (or updating) databases at runtime. If you want to include a database in your actual apk, then you'll need to copy the file into the databases directory. If that sounds like what you're trying to do, take a look at this tutorial.
If you just need to know how to work with a database in general, check out SQLite in the android documentation. Basically you want to make your own Helper class that extends SQLiteHelper, then create an actual Database class that makes use of the helper.