I'm actually starting to get into D&D and I may be soon buy the D&D Starter Set. Mimic is a monster whose concept I love, and I would like to put at least one as soon as possible when I'll DM, even if I have to change some little things in the base scenario.
But as I never DM'd or even played a D&D game, I don't have any idea on at what level can a party fight one of these monsters with a bit of a challenge but without risking everyone dies.
Based on played games (as DM or player), when should I introduce my first mimic to give my party not too deadly challenge ? (When = about what level?)
For more context, my party should be about 4/5 players who're medium used to RP but never played D&D before.