You cannot "make" your own, but breeding wise, one that looks like a cheetah would most likely be: ee/aa/TT/nC 0 (or ee/aa/Tt/nc (or CC) 0, which would be a Tan Cheetah pattern 0, on a Classic Slim build, classic mane, short mane or maneless
No, we don't have anything like that. But there is a lot of info here: www.deviantart.com/sheducats/g… Cheetah is (I believe) The most common marking, Tan is dominant over all other base coats (so a Tt or TT in the geno means Tan cat, even if the cat has ee/AA/Tt for example, it will still be tan)
People are currently looking for split litters and selling/trading slots atm for when the next breeding season opens up (October), you could always make a Looking for journal, or see what other members have available to help breed you a desired kitty (The discord chat is always active and friendly)