Can someone point me to where I should begin?
First is learn the basics and fundamentals you needed in trading, buy low sell high might sound easy but trust me once you are the one trading you will find some hard times buying low and selling high.
And one more question: What is the minimum amount of money needed to start?
About the capital for you to trade. Personally I started trading with just $100 and turned it to around $500 I guess in 3 months and I know many person who didn't started with big money some of my friends even started lower at what I have used before and now their holdings are big. Big or small with the right trading strategy you can make it grow in time.