How long do i have to wait to claim bankruptcy after getting a new credit card?

Long story short I do work but work has been really slow for me and I have 2 kids to support and have been using credit cards to supplement my lost income. I just got a credit card about 2 months ago and my last but we are out of money and I need to claim bankruptcy. I lost my home about a month ago witch messed up my credit so I cant get any loans so bankruptcy is going to be my only way out of this mess but Im worried that the credit card companys will press charges (can they?) for not paying them Ive never been in this situation has anyone gone through this and if so how do I get started?