If you can't make bail in Texas, you will stay in jail until you have served your sentence in full, have completely beaten your case through a not guilty verdict or dismissal, or until you are released on probation. To finally resolve a case, it can take anywhere from a few months to a few years.
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.
The court can grant bail after considering various factors, such as the nature of the offence, the evidence against the accused person, the likelihood of the accused person absconding, and the possibility of the accused person tampering with evidence or influencing witnesses.
Stay in the state of Texas until trial. Do not use any drugs prohibited by law or by the court (which even can include prescribed narcotics). Work at suitable employment. Report on a regular basis to a probation officer and notify such an officer of any address changes.