ennis shoes or Road Shoes? both, see if they have your clips
Bring pedals or not? no
Cycling shorts or gym shorts? either, wear shorts until class starts over unless you want attention
iPod or nothing? they provide the music
water bottle or nothing? water bottle! youll sweat your arse off, theres no wind resistance taking your sweat away
Anything else? a towl, you will sweat everywhere. also, bring a spare change of clothes, youll freeze when you walk out the door.

holla nasti nati, where i was born and raised! who dey!