After Effects Saving files as .avi in after effects.

I am trying to learn ho to animate my pictures and use them as worship backgrounds. However I can not figure out how to safe them in avi. format. Does anyone know how? Thanks. :) P.S. I don't know pretty much nothing about after effects and any of the terms you use.
File-Export-Add to Render Queue. Open the Render Queue and change the settings in Render Settings and the Output Module to what you need. Choose the file location under Output To. When you're done click Render.