I deal with 5000 psi compressors which are a bit different. but here is what I would recommend. First turn it over by hand a couple times and listen/feal for a clunk. If you have one you probably have a bad bearing in one of the rods. This will also get some oil on the bearings. other than that I would change the oil before starting it and after 10 hours.
3 months is nothing. I have a compressor that is 15 years old and rarely gets used, but starts up just fine every time. It has sat for over a year with no issues. I'm assuming this is an oil less compressor, as that's most of what Craftsman sells. No oil to get contaminated. Even am oiled compressor I wouldn't worry about if it's only 3 months.
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