wedding ring price problem?

I propossed almost 1 year ago. I gived her stainless steel ring, and she thinks that it is made of white gold. I didn't said her about my finance problems. Now we planning a wedding and I think we should make it cheaper and small (only family members). The wedding will be on my parents apartments, apprentice priest will go by himslef (he will take only 10 bucks). Honeymoon is planned in folk-rock festival (I got free tickets), Should I or my fiance buy some flowers? I haven't gived her any and I don't know how should I begin.

But also, the biggest problem is wedding ring. I have bought already a copper ring and will buy some gold-shinny paint and will spray it on the ring in my work. How long will the paints last (I also will buy the cheapest paint)? How often I need to repaint it? Or should I only pollish it? Will she notice, that ring is fake-golden? Would she be verry mad at me if she will found out about the ring?

Thank you, for your answers, and time. If I get many money, I will invite you..