Great idea with environmental attacks, and thank you for the cr info!

A good rule of thumb is a CR for a character class is 1/4-1/3 their level.

For fun encounters, be sure to include terrain and environmental effects that the players and creatures can interact with.  Pushing a monster off a ledge or dropping something heavy on their head never gets old :)

I'm looking to craft an encounter for 5 players, all new to the game. I'm hoping to involve a dragon wyrmling under the control of a sorcerer and was wondering if anyone has some tips on how to make it a challenging, but fun encounter.

My main inquiry is how people would run the sorc, and what challenge rating say a level 1 sorc npc would pose.

Looking to build an encounter for a new player group one shot