How can I develop any psychic abilities that I may possess and how do I know if I have any in the first place?

Everyone is capable of psychic energies.  It all starts with the 5 senses (sight, hearing, smell, taste, touch - tactile & emotional) that we use in our material life.  When we take them to the psychic sensitivities we add: intuition from the gut and I know from the heart.  In this way we are attuning ourselves to the energies of life.  This will help you identify if you have the capability - we all do - some stronger than others.

There are many approaches that work - when we have a talent, it is important to find a good teacher for the basics, then practice to hone our own abilities.  Psychic abilities can also fall into this catagory.  

There is also the do-it-yourself approach where you gather all information you can, then practice to separate the wheat form the chaffe, so to speak, through trial and error.  It can be arduous and time consuming, but the rewards are always worthy of the effort.

Mystic has many discussions on many aspects that will help you unfold.  The key is to take those sensitivities to the psychic and the tool is meditation.  Read up on all you can about meditation and the purpose you wish to use to make it a doorway to understanding the psychic.  Mystic Academy has some information at Mediumship Development that may help answer your questions.