Hi, and welcome.
Does your girlfriend have children in the Phils ?
I would also recommend that you visit the lady in the Phils, and her family, BEFORE getting married.
As far as UK visa requirements for bringing her here go, you need to start keeping written evidence and photos of your relationship, make sure you're in a reasonably-paid steady job (employed status) or have accounts if self-employed, and ensure that you have a bank account that hasn't been showing an overdraft for at least 6 months preceding your (wife's) visa application to come and join you here. That's for starters.
Be prepared to cough up several thousand pounds for the whole procedure.
