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I always run out of stuff to say because Im never in a talkative mood.
In that case, you need to focus on getting into a talktative mood, making it part of your personality and regularly building momentum. Be process-oriented... I went through this same thing over the years, to the point where I can regularly self-amuse and give value without getting too stuck for words (even though that still happens from time to time). Do things you enjoy, learn, expand your mind, but most importantly have all kinds of interactions.
Bantering with store people is good, practise striking up conversations and cracking jokes, getting to the point where you feel less stifled and judged, therefore more carefree. "Seeing the social matrix", if you will. Then when you start approaching more women you want to attract, instead of just being in a confident social mode, you will continue building upon this with better leading and seduction skills. But don't get too far ahead of yourself. You're only 16, time and patience is your friend (I started game and pick-up when I was a clueless 23 year-old five years ago).
Sorry I couldn't offer any specific routines, considering you posted this on the routines forum. But over time you will learn more about yourself, and the world in general, and develop your own style and way of relating to people (and specifically women). Everything you say will become more natural, although there could be many things you repeat because they're more effective in certain situations, and better represent who you genuinely are.