My blog secondlifehowto.com has lots of completely free tutorials on content creation in second life. Each post contains screen shots and step by step instructions. Recent posts include:
HowTo: Create a points dispenser that gives points to a HUD
HowTo: HUDs, Dialogs, and Floating Text
HowTo: Create A Field of Wheat
HowTo: Experiment With Particles
HowTo: Use transparent texture to create wings
HowTo: Custom animations and gestures
HowTo: Create a flying carpet
HowTo: Build A Cape
More description of each of these are provided below (and of course also at secondlifehowto.com)
HowTo: Create a points dispenser that gives points to a HUD
----------------------------------------------------------------------
This post illustrates how to use scripts to sell points to a HUD. This is something that could potentially be used to create a game. (And may potentially be used as such by me!)
HowTo: HUDs, Dialogs, and Floating Text
------------------------------------------------
This post explores HUD and dialog creation and discusses a trick I learned to put floating text on a HUD.
HowTo: Create A Field of Wheat
--------------------------------------
This posting goes through the efforts I went through to create a field of wheat.
HowTo: Experiment With Particles
---------------------------------------
This posting describes how to use a script to create different particle effects.
HowTo: Use transparent texture to create wings
-------------------------------------------------------
This posting was my first effort at transparency. It applies transparency to the practical project of creating wings for your avatar.
HowTo: Custom animations and gestures
-----------------------------------------------
This posting describes how to create an animation so that your avatar can do the white man shuffle on the dance floor.
HowTo: Create a flying carpet
-----------------------------------
This posting describes a simple example of a vehicle script in the context of creating a magic carpet.
HowTo: Build A Cape
-------------------------
This posting is a good first building example and illustrates how to build a cape for your avatar.