The vouchers are a pain......not money saving at all & in the long run, you could actually lose money on them. If you haven't paid for the dining plan yet....don't. You will get dollar amt vouchers ($15, $10) that you use to pay for your meal. You will not get change back on these, so you go thru the vouchers to make sure you're getting as close to the amt, without losing money on them. The character voucher needs to be used on the most expensive of the character meals offered as that is the price you paid for it.
We've done these once & will never do them again. We prepay on Disney gift cards & use them. Much easier to deal with, carry & after each use we know what our balance is.