Step A.
Get a coin. Label one side as 1 and the other side as 0
Flip the coin 256 times and record the results as you go in groups of 4. When you are done, your binary sequence should look something like this:
Big, issue, you flip same coin 256 times, so you loose entropy
the more different coins you throw the better entropy source you will get
I personnally use 32 hexidices to lower this impact