Learning how to Build a Wind Generator is not that difficult, basic step to built wind generator are
1. built wind  turbine
2. built a wind generator power
3. wind generator plants
4. prepare your batteries and electrical component

article below that i was found on doctstoc.com very useful for beginner that want built wind generator

How to Build a Wind Turbine Generator

then power point of basic understand wind turbine and wind generator

Wind Power and Wind Turbines

if you want to built your vertical wind turbine from PET bottle, article below will give you step by step tutorial

Vertical Wind Generator