Can you tell me about the rules and applications?
If you want something you have to give something, if you want something different you have to be willing to do something different. If you wish to have a change in your experiences you have to be willing to let go and allow change to occur whatever that may be. It is a give and take relationship.
However, I would be careful with your intentions because sincerity is everything in spirituality. In other words don't ask me questions with the intent to set traps or catch me in error, ask with the intent of true curiosity and the intent you really want to know or are searching for truth. Deception and spirituality don't mix very well and can have adverse effects so it is always best to be genuine.
That seems important if I'm going to start being spiritual.
Lol, you are already spiritual by nature you can never be anything else however it's your attributes, mindsets and experiences you want to expand. The point is to become aware of what you are unaware of ......on many levels. You can consider spirituality a cultivation if you will.
What are the fundamentals, what should I do to get started?
That depends on what you really want out of your spiritual awakening. There is more individuality than people might be aware of, albeit within an objective reality.