I agree with Peedal on this one, I'm afraid.
Proof that you have met is just that - photos, tickets showing you traveled, etc. It would probably be very difficult for you to get a fiance visa without this. They're pretty funny about it.
You also need to actually be engaged to go down this route. They're going to want proof that the you have begun the planning for the wedding, that you have booked a venue, made plans for your future, etc.
As for money you need to have, there is no set amount because each person's circumstances are different. If you're going to be here in October, you'll need to show that you have the funds to support yourself totally (or that she has funds enough to support you totally) until your wedding date. I arrived in the UK three weeks before my wedding, so I didn't need a whole lot of funds in savings. (I think I had about $1500 is all, in fact.) I'm not sure if they would consider a parent as proof of support, and I would be surprised if they would consider a parent not in the UK as any kind of support. But again, there are no set rules on this part. It's a bit subjective, I'm afraid.
Have you ever been to the UK? I strongly, *strongly* recommend a visit before you make any big changes to your life to come live here. It's a HUGE adjustment, and unless you have at least a little bit of an idea of life here, you're likely to be very surprised at how hard moving here is. I spent a month here before I made the decision to move, and even with that, I found so many things were different than I expected....it was not easy, and after 2 1/5 years I'm just now getting over the trauma of this move! Just some unsolicited advice for you.
Many of us here met our other halves online...so we understand how strongly you can feel for another person you haven't met.
Best of luck to you and yours! Getting here and making a life here isn't easy, but if your heart wants it badly enough, you'll find a way!