I bought a mavic mini today and after first flight a smell is coming out of drone why please help

Sorry to hear that, is there any physical damage with the drone? If yes, may we have a picture? Will it be powered on again? Is there error message in the APP? More details would be appreciated.

Smells like flowers, crispy, coffee? )) Need a proper wash in washing machine ))....

Now as serious as can be: first time use smells a little like plastic and heat...pay attention if smells like burned circuitry, than is a problem...check at next flight...try SPORT mode as is the "deadliest" for drone and battery, for 10 minutes, then land it and check if smells like burning...if YES, check if smell is from inside drone or from battery... If is from inside drone, need to check it as something is wrong (possible overheating of CPUs)...if from battery, store it like is a small bomb, if a battery have problems can also explode or get to fire....and send it to warranty...
If smell is not present after SPORT mode, just go and fly...was only the usual smell from first time use.

Good flights.