Filing a chapter 7 bankruptcy?

if anyone here has any knowledge about bankruptcy laws please help me i wanna fiile for chapter 7 bankruptcy i made a few credit card mistakes in the past now i don;t have a way of paying it back i read some things online about filing for chapter 7 but the info wasn't really what i was looking for I need to know how much would it cost me to get a lawyer for the case and how soon after i file could