Making money with Unity

Hello there,

I got a simple question. Is it hard to get to the game industry? Making money just with android or iOS games? Because that's what I like to do, that's what I want to do.. I just want to know if it's worth it spending time on it.. I'm one person, I can write scripts and I can even model, make music, simply I can make games alone. I've already created something but never done it.

Also I don't really know what do I need for making money with Unity.. Do I need Unity Pro? Or can I do it with Unity free? How does this "in-game-ads" works and how can I add ads to my games?

Thanks for all answers.