Why are you terrified to post here? We don't bite.
The cheapest way to convert the bike is probably use your current wheels and convert it to singlespeed. It is likely that the rear wheel has a freewheel hub, which means you could unscrew the cluster and replace it with a single speed freewheel; however, I am not certain if it is a freewheel hub, but it most likely is. That way, you don't need to buy new sets of wheels which might cost a lot and create toe over lap problems. Maybe a new crankset is necessary as well.