I'm new using this emulator..how do I apply official patches/updates to the game?

[LunaMoo]

No, don't even try isotool nor any other program on non-psp device it'll just break your game backup by sending encrypted data in place of the decrypted one, because we don't have kirk decryption keys for the updates and since psp life is pretty much at the end might as well never get them.
You can do it only on the real hardware, so either have your own, or bother some friends who still have one of those, pretty much same requirement as for getting umd-only games legally as you can't really buy umd drive separately.