hello sajha friends I am also confused how this green card by employements works.

The thing is that i am working in a gas station for 2 years and my owner is real good. He even has said that he is ready to help me make green card by employement. And i am in F1 status and i am taking regular classes.

So, could you please help me know how does it works and how long it takes and how much it costs approximately for all this process of green card. Is there any chances of not getting approved.And my boss has 2 gas stations which they have been owning for 4 years. And do i have to get a lawyer for this??? And i am in texas now .

 hoping to hear some good replies soon. thankyou