you basically follow these directions for every letter. play around. :-)
Step 1: The Outline
we will do the letter E. start with an outline. see the picture first.
Step 2: Boxing It Out
make the thin lines box out.
Step 3: Connect Boxes
connect the rest of the lines to make the major part complete.
Step 4: Branch Out
branch out the corners and start the 3D affect. see the picture.
Step 5: Connect Branches
finish that 3D affect.
Step 6: Shade
just fill in the outside boxes. this is optional. :-)