First, the person is arrested and taken into custody. Next, a bail hearing is held where the court determines whether the person should be released on bail and sets the conditions for their release. These conditions may include surrendering one's passport, regular check-ins with the authorities, or a monetary deposit.
No - if you signed the bond it doesn't matter whether you have a job or not - or whether the bondsman asked you if you did. You are liable as surety on the bond - having a job or not has nothing to do with your liability. Sorry.
You can withdrawl your agreement by calling the bondsman and telling them that you no longer want to be on the bond as you feel the ``criminal'' will not show up to court. You can sign off of the bail but they may arrest your friend.