In my experience with rats, heres some answers to your questions:
1. They are still itching, is this normal? How long should I expect them to itch?
Normally after a day they should have stopped itching if they have been treated properly, but you say they lick there feet before doing so, so could be that they are simply preening as they do itch when they preen sometimes but if you are worried a trip to the vets might be in order!
2. They are sneezing a lot, I read in another post that was normal in a new home. (Just say yes to ease my mind please heh)
Like what padfoot said it could be an allergic reaction to the bedding etc... but with sneezing, i'd beware as theres a disease rats can get that makes them sneeze and its contagious, try changing the bedding and if they are still sneezing afterwards and you are still worried take them to a vet as soon as possible to be on safe side as they could need antibiotics!
3. What kind of toys are safe? I have never had a rat, only mice (and my wife has two hamsters) is there any they _shouldn't_ have? Right now they have 3 balls made for cats (With bells in them.) They enjoy carrying them around the cage, and tossing it into their food bowl (little sports fans heh)
If you can get hold of it from a builders yard, brand new drain pipe makes the best ratty toy as they can run through it and play hide and seek in it, and pretty durable so hard to chew through. Also branches off fruit trees as they love to climb and wooden rat toys (not hamster as too small) or hammocks they can sleep and play in. I used to occasionally give my rats general purpose compost to play in as well as they loved to dig! A solid rat wheel is a good idea as well gives them plenty of excercie but it must be solid so not to trap there tails or feet!
4. I have found plenty of good things to feed rats but I can't for the life of me, see how much food I give them each day.
I used to feed my rats a handful of food each, each day but i also went on how much they was eating and how many treats they had, had that day. My rats used to love cornflakes and used to beg me each morning and they got into a routine of sitting and begging at breakfast time
Anyway goodluck with your new little buddies