It would be great to have new rotors for every new pads, but then it's also nice to have a fresh set of slicks for every track session. You will be fine, don't worry about it. I swapped my pads way too many times this year (so have others), you will be fine at the non professional level.
Oh yeah, I bought a 50 or 100 pack sandpaper. It's the special 80 grit one that one of the forum member recommded. Let me know if you want a few, I have a whole stack of them and they are taking up space. I have to check exactly what they are.
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