You need a good book on basic refrigeration.
Moisture and contaminants are the killers of refrigeration systems. Not only do leaks allow refrigerant to escape, they also allow air to enter the system. Air means moisture. The only way to remove the moisture is by vacuuming with a specialised compressor. The basic steps are pulling the correct amount of vacuum for an extended period of time to remove all moisture. Using the correct procedure, the vacuum pump is turned off, and disconnected from the system without loosing the vacuum. The freon is then allowed to enter the system, while it's still under a vacuum. This is called charging the system, and needs to be done in correct manner. The compressor is not running when this is done.
You state you "filled your compressor with fresh oil" If you didn't follow the manufacturer's directions, and literally :"filled" the compressor with oil, you could have big problems. If you did this, drain all of the oil out, and start over, using the manufacturer's guidance.
If you want to service/build your own refrigeration/air condition systems, get a couple of books such as Haynes Automotive Heating and Air conditioning, or Refrigeration for Pleasure boats (by Nigel Calder). Calder's book gives you the nitty gritty of building/maintaining basic systems, while the Haynes book discusses the basics as they directly apply to cars and air conditioning.
Good luck