First, welcome to the Domino world. I wish you much success.
To start learning Lotuscript I suggest that reading the Application Developers Help DB. It does a very good job of explaining the Domino development world. It also provides code samples for @commands, @functions, Lotuscript, Javascript, XML, etc.
You can also look at the Introduction to Lotuscript presentations on Gary's Page:
http://lotuspro.e-promag.com/DPGary.nsf/GarysList?OpenForm
There is an IBM Redbook that you should download: Domino Designer 6: A Developer's Handbook
http://publib-b.boulder.ibm.com/Redbooks.nsf/RedbookAbstracts/sg246854.html?Open
here are more sources:
http://www.lotus.com/products/product4.nsf/wdocs/dominodesignerlibrary
There are also many books available, such as the
Lotus Notes and Domino 6 Programming Bible. (sorry, I am not plugging one book over another... other authors feel free to post responses here with links to your books)
Next I would watch some of the webcasts on lotus.com, and look at the old issues of LDD Today on this site.
Finally, I want to make sure to mention that there are excellent courses that you can enroll in:
http://www.lotus.com/services/education.nsf/wdocs/educationhomepage
Happy coding
Alan - IBM