If you love this lady then the best option is to apply her a fiancee visa than visitor visa as this will likely get a refused but first you must build evidences that your relationship is genuine ie. keep all the Y! Messenger chats, phone calls, emails etc.
Spend some few times reading all the success story from the members of this forum and you will find them just right here in this forum! All your questions about applying a visa has been already answered here.
