If you think of it as a small business, the initial investment in equipment a good laptop/computer, one to three monitors, fast internet server, and software. You can stay in bed when you are sick also, no need to got to office, no need to wear tie, you can trade in torn T-Shirts and slippers.
If you want to know more about trading there are many books available for beginners in trading. Here is some books for you
Book 1: The Art of Forex Trading
Book 2: FX Bootcamp's Guide to Strategic and Tactical FOREX Trading
Book 3: Forex Trading Made Simple