how to make a bird house?

Answer 1

First off, figure out what kind of birds live in your area, and what kind of birds might nest in your yard. Then build an appropriately sized house for that species. There are tons of birdhouse plans available out there if you do a google search.

More info here:

http://www.birds.cornell.edu/AllAboutBirds/attracting/nest_box/

Answer 2

not sure what kind you want to build, but here is a website that might be useful:

http://www.npca.org/wildlife_protection/make_a_difference/bird_house.html

you might want to do a search for other options.