Congratulations on your thinking about riding tandem. This forum is a wonderful resource for information. You should start by reading
TheTandemLink site under the Learning tab . What you find there will be useful and mostly validated by folks here.
IMHO the bike in the ad is not likely to give you the experiences that will lead to a long and happy career as a tandem captain. Zonatandem has pointed to lots of good used tandems in a thread titled "
Trying to get a road tandem..."
Best of luck with your quest for tandem...
Cheers!