Drew,you need to call up your local Registry office to book an appointment to see the registar,ask them for as much info as possible and make sure you have all your fiance's details and the place you are to be married with you when you attend
And as stated in previous post there's a 3 week wait before you get your CNI to which is valid for only 3 months.Good luck mate like you I'm getting married to my Pinay GF in 3 weeks time in Mindoro I actually leave on the 27 May and will post some pics of our special day when i return