No tutorials are avaible on this subject. You have to learn by looking at code.
One good idea for starters is to study the somewhat old-dated but still usefull Lambda CORE Programmer's Manual which explain how the objects in the original Lambda Core were programmed.
Next, you should browse a few interessting objects (e.g. $room or
$thing) with an object Browser. At TECFAMOO, see section
16.3 on page 
for the
using the E_WEB browser.