That's only the beginning!

1.

You might think that the job of a baseball player's agent would be to get his client the best possible
deal with a Major League Ballclub. But, that's only the beginning of an agent's responsibilities.

(click here for original context)

2.

The teacher says that's only the beginning of his problems. He's also been caught cheating on his
test, smoking, and drinking!

3.

There will be sightseeing on the island, but that's only the beginning. There will be deep-sea diving, paragliding and a beach party.