Yeah I know it will be a bit hard for him and I mentioned in one of my previous comment before the game, it's simple Atalanta knows it Mbappe's debut for the club(realmadrid), despite being a good player they knew he will want to have at least a goal on his debut so there was so much attention on him, they did came up with a strategies plan on the second half to divert their attention a little and made him unstoppable to get a goal although he messed up a little...
About the club, sure they are confident to take any team , maybe they're coming for the next UCL title we can really be affirmed but we know they are capable with their squad let's just see how it goes
Now he has shone at his debut, let's see how well he'd adapt at the club and also, let's see if his attitude will remain the way it was while he was at PSG because you'd often notice him waiting to be fed the ball back there but at Real Madrid, we saw him fighting for every ball and every little chance he got he wanted to utilize it well. You could see he was desperate for the fans to fully accept and love him.
I'm full of anticipation for Real Madrid this season. At least with Mbappe's presence, Vini Jr's creativity will be fully used as there will be a great finisher to give good results.