What size wire and breaker do I need for my shed/workshop?
You will not be using everything all at the same time. So I would look at the nameplate Full Load Amps of your largest load, probably the table saw, plus any other things that might be running at the same time, such as the dust collector,  lights and if the compressor is on a demand pressure switch, add that too because it might come one without you turning it on. Then add another 25% for good measure.