So I have a (PC) laptop with 8gb of RAM and I'm running CC on it. I haven't set it up on this before so I'm wondering how much should I set the RAM usage to in performance so I can use it but not ruin this laptop?

I just don't know where specifically to put the RAM at in the preferences option.
I mainly use it for digital painting and sketching on this. (not so much painting on this but digital art)

8 GB is about the realistic minimum for Photoshop nowadays.
Set it to about 70% and go for there.  Note that it represents a maximum percentage of your momentarily available RAM after the OS and other running application have grabbed what they need., not a percentage of total installed RAM.  It changes continually.
The rule of thumb I follow to figure out scratch space says to figure on 50 to 100 times the size of your largest file ever multiplied by the number of files you have open.  I have seen the scratch file exceed 800 GB once, an admittedly rare occurrence, but it often exceeds 200 GB when stitching large panoramas and the like.
As an example—and stressing that I'm aware that others have even more scratch space than I do—I keep two dedicated, physically separate hard drives as my primary and secondary Photoshop scratch disks and a lot of GB free on my boot drive for the OS.  I also have 16 GB of RAM installed.
Additionally, if you only have a single HD, i.e. your boot drive, you'd need it to be large enough to accommodate both the swap files of the OS as well as Photoshop's scratch.

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