You should now see all the wifi networks around you.
The files you will find in the path you invoked kismet from. They are the log files. Kismet should also start up the GPS in order to record the locations of all the networks found (so you can plot them on google maps 'n sh|t).
This all assumes you have rootsh and powerkernel installed.
Also, kismet is the AK47 of wifi sniffers. Can you explain what it is you want to do exactly?