As far as necessities go you need the following:
1)A Racquetball Court
2)A Racquetball Racquet
3)A Racquetball
4)Goggles; most places due to safety won't allow you to play without them, and it wouldn't be a good idea.
The extra stuff includes, but is not limited to:
1)Headband
2)Armband
3)Glove
4)Underglove
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Usually only official racquetballs are used to play racquetball and are required to be used in tournaments.
No,a racquetball racket is too light for playing tennis. You can not bear the hitting power of a tennis ball with a raquetball racket.