Mabuk dan gila has some great advice, especially on the SIM card. Even if they are not available on the flight for some reason, you can buy them in a shop after you get your luggage.

And I would NOT have your friend come the night before. Staying in Manilla near the airport would be a huge hassle for her logistics-wise and totally unnecessary, especially as she is scheduled to arrive after you on the morning of of your flight.