calendet j2me

I am asked to write a calendar (datebook) like program using J2ME. The
required funtions are pretty standard,

1) input a task to do at a given date and time.
2) get a reminder message at / before each scheduled task.

Can anyone kindly point me some starting points? I never write such
kind of code before.
For example, what classes/packages I should take a look, or any example
code will be great.