Hello!What kind a coach is good enough for a newbie team?I mean what level?
Everyone has the same coach. EVERYONE. What you seem to be asking is what level
Trainer you should have.
Honestly, there is not yet enough information to prove that a level 9 or 10 trainer is any better than a level 2 or 3. That said, I would recommend a level 5 or 6, or just whatever you can afford. When I was new, I got a level 9 trainer the first week I had a team, and he really made my weekly expenses difficult (particularly after that $50k/week newbie bonus went away).
Just as a basic rule of thumb, I would say that the total weekly salary of your staff (Doctor, Trainer, and PR) should be
less than the total salary of your players.