to find out what firmware you have, Go to settings, second from the left, then go down about half way and choose system settings, and then go all the way down and choose system information.
as for how to Jailbreak your PS3, just have a good look around, if you can't find the answer, someone will get back to you.
when you have found the firmware you are on, ost again, and someone will point you in the right direction