Would you guys recommend an MCC course to a newbie? i mean a fresh CPL?
for that first job
From your profile you are only 17 so can't of started anything serious yet, but you need to do a lot of research if you are considering commencing flight training.
Your post only says a fresh CPL, just to clarify a CPL alone is useless, you need a CPL and and Instrument rating with ATPL ground school to get anywhere useful.
If you then want to fly a multi crew aircraft - which an airline job will be - you would need an MCC course completion certificate before you start your type rating. This is the very last step before your type rating, so there's no rush to get it, it doesn't expire, and only takes two weeks at a typical cost just under £2k, so leave to the very end.
With your basic ATPL groundschool - CPL - IR, you could add an instructor rating and instruct, or fly single pilot ops if you're lucky to land a job parachute dropping, aerial photography, air ambulance, there are quite a lot of options if you do your research. The key thing is to make some contacts before you start, or along the way. Getting your first job is very little to do with piloting ability or qualifications, and mostly about personality and who you know. At the end of the day everyone has a CPL-IR, so you have proven you can fly, you will need a contact to get that first job.