Module development and code questions

I was wondering is there any tutorial available on writing modules in drupal to new users .It will be really helpful for newbies like me to start writing modules .I want to write a course module for my website . I can write code in php ( not an expert ) .I want some help to start writing a module .I really apperciate if any one can give me some guide lines .
Thanks
Drupal Newbie

I have created a module which adds features to event, but doesn't add nodes of its own. I have added a table which includes the node id. When a node of type event is deleted, I want to delete all rows in the new table with the corresponding node id. How do I do this?

Rows should also be deleted when a user is deleted.

How does Drupal track sessions? Is there any information available on how this is done with drupal? I am familiar with php sessions but have been able to nail down how drupal uses it.

Thank you,

Sadian

Has anyone developed or given though to developing mechanisms to export user profile data to vCard format, or for exporting events as vCalendar files? Is this something I am better off generating with a Perl script rather than going through Drupal?

Information about the formats can be found at
http://www.imc.org/pdi/
http://www.imc.org/pdi/pdiproddev.html

I have a piece of code that works to provide functionality that drupal does not. This will allow my users to upload large files directly to a specified directory on my server. I've attempted to utilize the filestore.module but unfortunately because it stores binaries in the SQL database rather than on the hard drive, it will not work well for my files - which are frequently between 20MB and 30MB in size. I do not want download functionality - only upload.

Hello everyone. I have uploaded to CVS versions for Drupal 4.3 and 4.4 of a module I've been developing to allow users to view and download files from an existing directory structure. It's similar to Apache's indexing functionality but is controlled within Drupal (user access, etc). It also includes a page for users to track additions to the file archive.

I've found it useful. Let me know what you think...

Thanks,
Spoopin