Congrats to you! Welcome to the wonderful world of rats!
Yes you should let them settle in, they are probably very scared. It's ok to stick your fingers in once they get to know you, but it's only a good idea if you never feed them through the cage bars. If you do feed them through the bars then you can expect them to nip at you when you stick your fingers in. I always just open the door to feed mine and they never nip me when I stick my fingers in to say hi. They are smart, they will learn the difference.
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Six new rats