Been a while since we've done the B to C transfer.
Once your thru immigration you'll go thru and into the baggage hall, you'll pass the customs desk, hand in your white form and then there is a bit where you drop your bagws off for connecting flights.
If you arrive late, and cutting it fine for your Orlando flight, speak to one of the staff in the hall and say you have a connecting flight and they will let you skip to the front.
After this you pop up the escalator to get the airtrain round to terminal C. The airtrain runs every 3 minutes, and the time between terminals is about a couple of minutes. When you arrive at Terminal C you will have to go thru security, so dont bury the passports/boarding passes too deep in your bag. There are 3 security stations at terminal C, once you come thru you will see overhead signs with the gate numbers, and either in front or to the side will be a bank of screens with gate details for your flight. Check what gate your from as it often changes at Newark from what you'll get on your boarding pass issued at check-in. If you have time - and a pizza person - famiglia's pizza is amazing! Once at the gate keep an ear open incase they want you to confirm you're actually there, by showing your boarding passes at the gate desk. If the flight is full and they have standbys then they will often do this.
When you come home your bags should be checked through for both flights and will be a case of getting the airtrain back from C to B.
Never flown with SAS, but so long as its a pre-merger-Continental (as opposed to a pre-merger United, as United/Continental merged) aircraft you have for your Newark-Orlando flights you'll either get live TV for only $8 or an amazing on demand entertainment choice. Meals will be chargable so if you get a chance, grab something in the terminal.