After you got the measurements, cut the wood and leave a little bit of depth for later.
Step 2: Shaving
Measure the pre-bow and divide it in half. Mark the half point and two inches on either side to give a four inch handle. Start tapering the board, going away from the handles and sand liberally. When it's reached preferred size, check the flexibility on your knee.
Step 3: Tie
With a hack or bandsaw, cut two small nocks on the edges as a square triangle, the 90* pointing down. (couldn't find degree sign) Then using your leg, pull the wood into shape and tie it. My most recommended string would be kite line or synthetic sinew.
Step 4: The Kaboomer.
To make an arrow, Cut a thin dowel to size and add a nock on both sides. (one larger than the other) Find or buy feathers and peel away one side so you have a half of a feather. Use three half feathers per arrow. Using a tiny bit of hot glue (just enough to make it stick) glue the feathers on, two parallel from the nock, one aligning. Make sure the feathers are about a half inch away from the smaller nock.Then with sewing thread,thread string through the feathers flumps and pull taught to keep the feather bits on. Then on the other aide, get a thin bone or strong rock and put in in the larger nock. Then using thread or yarn, tie it in using diagonal type wrapping.