I'll just list things that have helped me play him:
1) If you are being chased, or focused, pop you ultimate and make your clone move away while you stand still. Generally this tricks people into following your clone and gives you time to escape.
2) You can use your Q to gap close over large areas of terrain by casting the ability on the other side of the terrain, similar to how ward tricks work:
As for build orders, it depends on what you want shaco to accomplish. I generally use a split push build when I play shaco to force someone on the enemy team to always be pushing back a lane. Because shaco isn't good in team fights, I find it best to indrectly force 4v4 fights by using this method.
You can run shaco as an assassin and jump on/kill the enemy ADC/APC.