Which inks did you get with the printer?
I'd guess not Sawgrass, as the instructions would explain everything.
Have you bought sublimation inks? I don't know what other sublimation packages come with, but I'd have thought that an "inclusive" package would come with sensible instructions?
If you've not bought a "sublimation package", then it's not going to work for sublimation - the main thing here being that you must use sublimation ink, or else there will be no proper transfer of the image onto your substrate, resulting in frustration and lots of waste!
If you have bought a sublimation package, then it ought to have come with an icc profile specific to the sublimation inks supplied and (maybe) the sublimation paper that you should use.
The icc profile will do all of the hard work that means that the colours that your image has are (reasonably!) properly reproduced on your finished sublimated article...
The paper size settings are down to you - we print 3 mug wraps per sheet of A4 paper, as that suits us, but some people buy in pre-cut paper and print onto that. The latter has the advantage I believe of allowing a larger print on the mug, as the pre-cut sheets are actually larger than is possible by utilising our method, but our way works for us and I think allows a little cost saving over the other.
If you come back with more details about your setup, you'll receive more specific advice, from those more knowledgeable

.