Don't do anything with that voucher yet. You probably have 30 days or so to use it, so spend the next 25 getting ready.
Do niche research, keyword research, build (yes, I said build NOT rip) a landing page, build a second landing page, install Prosper202, OpenX, get the codes on the pages, and so on and so forth until you're ready to launch.
"If I had eight hours to chop down a tree, I'd spend six hours sharpening my ax" - Abraham Lincoln