I am interested to work from home.Is there a way?

Question

I have a PC at home and i am left with a lot of free time.I am also hearing a lot about working from home bussiness.I am thinking about it.When i researched it further i found that i will have to invest some amount(atleast $25) to get started.Is it safe to invest money on the internet and how i trust the sponsors or the website.Awaiting for valuable suggestions