There is no easy money on or offline, just start with something you already know. You'll fail plenty times before you start to "get it" and you'll have to learn everything on your own. Ask more productive questions and you'll receive lots of help. Ask for a handout and you'll either attract scam artists or get bunch of dumb answers.
I appreciate the fact that you are here asking questions, that's what this forum is all about However, what you have asked would really require someone to write you a complete course on Niche Research and unfortunately you won't get that here I suggest the "4-day money Making blueprint"... It really is quite exceptional and it will Teach ANYBODY how to make money in No time