Some times on family violence cases they do not set a bond because they want the person to appear before a magistrate and get a magistrate's order of emergency protection (MOEP) in place before they bond out.
In Harris county, most judges will allow a defendant to come in with a lawyer and a bonding company, put the MOEP in place, and let the person leave to go walk through with the bonding company - especially on misdemeanors.
You should hire a lawyer first.
No, when a warrant is issued a bond is not already set. The bond has to be set by the judge. The bond could be above or below the requested amount.