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.

How to file income tax return without form-16?

I have not filed income tax for 2 years and I want to do this now.

Unfortunately, I lost form 16 for year 2006-2007 due to postal mail. Is there any way to file income tax without form-16 for this year?

Also, for year 2007-2008, I have e-Form16. How do I file IT return with e-Form16? (It is a signed PDF document).