1: you need to bleed your oil pump!
To do this, undo the small philips head screw at the top of the pump, when it stops blowing bubbles and a steady stream of oil flows replace the screw
2: you need to prime the oil line!
To do this (when you get the bike running again) Start the engine and pull up the cable to the oil pump (Gently) until it comes to a stop, this will open up the pump pulley and allow the pump to stroke fully so the line to the carb or intake will be quickly filled with oil, if you have a clear tube you will see it