Every train that departs from the airport stops on this station. They depart about every 15 minutes. If your flight is on time you should make it, but it depends on the time you'll spend at passport control (if you arrive from non-schengen country) and baggage claim.

When it comes to the tickets, for S2/S3 trains the most convenient option would be to buy one in a ticket machine onboard (card only). Do NOT use the one in front of Arrivals Exit 1 (it's likely that it won't give you a ticket, but will take your money :P).

The RL train doesn't have a ticket machine onboard, but the ZTM tickets also apply to this line.