You might want to spend a little time searching this forum since most (if not all) the questions you'll have will have been broached here at one time or another.
Having just helped my daughter finish a school project on wind generators here are a couple of questions you may (or may not) have thought of so far:
* How much power is required for your project? A small wind generator is nice for demonstration purposes but if you have a specific use for the generated power you will want to be sure that your generator can meet the needs. For example, the demo is going to light some lights and spin a merry-go-round. There's not a lot of power available to a set of blades with only 12" or so swept area. (Very) roughly
Power(watts) = 0.0012 * V^3 * D^2
where V is the wind speed in mph
D is rotor diameter in feet
* How will you drive the generator blades? Will this unit be placed in the wind or will you spin the blades by hand or 
* Are you going to build your own generator or use an DC motor? Most DC motors like high RPMs which impacts your blade TSR.
Good luck with your project.
Paul
