1) No you don't have to have a sump, it will just make your life easier in the long run.
2) I would suggest selling them or giving them back to your LFS
3) Get new sand, either purchase live sand, or get southdown playground sand and see with a few pounds of live sand. I wouldn't use a decholorinator, water that is recommended is RO/DI water or just RO water. You can purchase this at walmart or purchase a RO filter for about $99 which is what most reef builders do. Plus your family can have fresh pure water.
4) You need to look at a saltwater supplier for test kits, good test kit brands are: Seachem, elos, and Salifert.
Welcome to RB Edd!
