Step 1: What You'll Need
Good sized "L" Bracket
Small wood screws (of the flat headed variety)
Large wood screws
Tape Measure or Ruler
A Stack of Books for Weight
A friend at work gave me a stack of Stephen King books that were collecting dust in his garage. My previous two shelves from the introduction were free books that my public library was trying to get rid of.
Use a book you don't mind never reading again.