- Run an ERC
  - Run a DRC
  - Check stop mask - do you want tenting? 
  - Sometimes its cheaper to have both sides masked the same so mirror any stop masks like 'heat sink' planes onto the other side
  - Check the layout with Gerbv or another gerber viewer 
    * are the bottom and top lined up?
    * Are the holes in the right place?
    * silkscreen looking good, nothing overlapping?
    * bottom/top components there?
  - (optional) Sometimes its cheaper to have fewer drills, so edit the drill file to keep the tool number low (sometimes your CAD program can do this too)
  - Do you need scoring?
  - Do you need panelizing? If so, scored or tab-route?
  - If you panelize, make sure to send your solderpaste layer for them to tile at the same time
  - Do you need lead free?
  - Did you stick some fiducials in there?
  - What color mask and silk? For me, blue and white.
  - What finish? I like Gold Immersion
  - For panelization, 3mm holes in the corners will work best with an STP-350 printer