Do chakra and energy field meditations (drawing up earth energy, drawing down cosmic energy, visualizing white light and strengthening the aura) and focus on your breathing. Try to still your mind. Also, start paying attention to your dreams. Keep a journal. And then practice. Test yourself. Ask questions and seek guidance and extra-sensory information at every opportunity. You'll find that advice in almost every resource you read. I've been studying psychic development for years and that's pretty much 99% of what I've found, repeated in several different ways. My goal is the same as yours. I've been interested in psychic development since I was the same age as you were, but only within the past 3 years or so (21 years later) have I been pursuing it with almost single minded dedication.
Good luck on your travels and welcome to the forums.