From Schonefeld (which is the location of one of Berlin’s airports), the S9 goes into central Berlin and north-west, and the S45 skirts along the south (taking in Schoneberg) and west of the city. These lines terminate at Shonefeld, so all trains from there should be going towards Berlin (there are suburban lines in other directions).
Buy and validate a ticket on the platform (there are no gates). A single fare for zone AB is €2.10, and a day ticket is €5 or €6.
Inspections are frequent and (this being Germany) rules must be obeyed. I have seen confused tourists, pensioners, businessmen and polite middle class families all being caught. No excuses accepted. The fine is €40.
I was in Berlin last year. U-Bahn and S-Bahn network is very good. I think that the price of 5-day ticket is around 26.00 euros. Also, I was working in Berlin for a month, and my collegues told me they don't use car, because of good traffic infrastructure. Schoenefeld has moved! It is now in Zone C. A single ABC journey is €2.80, a day ticket is €6.50.
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24, 48, and 72 hour tickets are also available at Schoenefeld airport and are recommended as they offer discounts at many attractions.
Transport information on: www.berliner-verkehr.de/traffic.htm