I wanna find the customers, can you help me??

I wanna make money online. I have some accounts Google ads, Facebook ads. I have service about advertisement but I can't find the customers. Can you give me some key-words which is searched on Google.
Which is forum talking about Google ads, Facebook ads and GDN? Can I advertise on it?
How I get the customers and what should I do?
Someone helps me :(
Add my skype: hoangnamng13