I think you're thinking too far ahead, and making yourself confused. Before you think of buying property for you and your gf, first, you have to set foot in this country. Live here for a year and see if you will like it. After that, look at your options.
Second, about the wedding costs, again, you are thinking too far ahead. Get to know your girlfriend, her family and friends first. Are you planning to work here or do you have a pension which is enough such that you do not have to work? If it's the latter, why don't you plan the wedding yourself. If you intend to do this, assume that everyone is going to take advantage of you. A family member of friend might suggest where to get catering, flowers, photography, etc., who then will overcharge you so that the referring person will get a kickback. Even the purchase of the property. It is likely that someone will get something from you.
Third, the 300k peso wedding, property, babies (from previous posts), what is the common denominator in all these? MONEY, as in YOUR MONEY. Who is putting these things in your head? Your gf? Who is used to living a provincial life. Hmmm. Take a step back. Relax. Because I think you're slowly getting overwhelmed and confused, which in turn could make you feel miserable.