I didn't address the sewer drains.
On a 96 model, if you have a toilet (yes, some only have a portapotty), you will have a grey water and a black water tank. Grey water is from the sink and shower (if you have a shower). Black water is from the toilet. I have seen a few post on this forum where some older campers only have one tank and few where someone had re-plumbed the pipes dumping grey water into the black. You may have to do a little investigation to figure your systems out. That's all part of the learning experience.
Words of wisdom given to me when I bought my first camper: Never, Never, Ever, use a broom stick to unstop a tank from outside the camper.
Good luck with the your new toy.