Check Aminet for example code, there is plenty there and should give you a good idea.
AMOS is very standard BASIC, it's power come from it's large command set that allow access to the Amiga custom chips.
Should you prefer to work with the Amiga OS (as well as te custom chips), then Bliz Basic2 (or amiblitz as I think it is called now) would be a far better choice.