Three are not enough. Five is the magic number.
Here is a link to those 5 with animated sketches illustratiing each. If each is read thoroughly then the animation is clicked., it should be easy to understand and to see what the caster needs to do in order to make the rod and line do its job.
I would highly recommend that all new casters bookmark this link, and review all 5 "tips" before each practice session.
Virtual Fly Casting - Instruction - The 5 Essentials
I would suggest watching your backcast while casting, and taping your casting motion as Dan suggests, then comparing what you see in it to the animations above and trying to figure out where you are going wrong. That is assuming you can't, or don't want to get any casting instruction.
If you don't know the basic mechanics required in a cast, how can you self-analyze your casting?