How do I file my tax and get a refund if I work 1099?

Hi, I was advised by my tax lady that all I had to do is pay an estimated tax of 10% on what I make every quarter, which I have been doing. My question is how do I file my return and get a refund and do I get any money for my kids? I always file with W-2 so this is the first time I am only filing with 1099. Any idea will be very much appreciated.