Subpoena received - city of st louis

[Mian Rizwan]

Have a small multifamily in North county St Louis which is "managed" by a property management firm. Received a letter from city today summoning me to present to court online given

- change of occupancy has occurred without first securing a certificate 

- Missing carbon monoxide detector outside 1 unit

To be honest, I have never been to court before - do I need to get a lawyer ? what to expect during such hearing 

When I read city ordinance # 67914 there is even mention of heavy fine and Imprisonment  !!