The reason why you can't find many details is frankly not very many people use it.
It's very different from the WDW plan, and most people around here would not recommend the DLR dining plan. Here are 3 negatives about the plan:
1) It does not save you money unlike WDW's dining plan. The very best you can do is break even.
2) You get vouchers instead of "meals". So I think for the 3 day you get a couple snacks, a character meal and a few $15 vouchers (that can be used at CS or TS places). The snack vouchers are valued at $5 and the character meal/table service is $32 I think. When you want to use a snack voucher say for a Dole Whip for example. It costs something like $3 or so. You use your $5 snack voucher but you will not get change, so you basically spent $5 on a $3 snack, putting your dining budget at a deficit already. That extra money can add up quickly, especially with the $15 vouchers. The only way to break even is if you use the vouchers for something more expensive than it actually is but then you have to pay out of pocket to cover the difference, which kinda defeats the purpose of having a dining plan.
3) You can't use the vouchers at Downtown Disney places, which is where a lot of the best table service places are.
What many people do recommend, if you want to prepay for meals, is putting the money on Disney Gift cards. Those gift cards can be used at pretty much any food place at the resort, including DTD and some snack carts. That way you know you won't be losing money.