Good questions, Jane... thawing a frozen pipe that has burst is definitely something you need to be prepared for...
To start, know exactly where that main shutoff is just in case.
Next, keep the bath taps open as you have them.
Then, take a hair dryer or even a paint stripper and start to try to thaw out one pipe at a time. It can take some time, but most piping materials conduct heat real well and pipes usually thaw out.
If needed, add a salamander heater (or similar) in the garage to speed the process (keep windows open).
Finally, cross your fingers that this works...
Hopefully, that will get you up and running. After that, pop back and we can discuss ways to prevent this in the future, OK?
PS: If you do leave the home I would definitely shut off the water main...no question!