Real Madrid started better than Barcelona. However Barcelona's performance was still good actually. They just struggled about finishing up their attacks with a goal. Maybe it was a really bad luck. But we would find out about it by next week games. Real Madrid might have lost points too by the way because they had to make a comeback from a 1-0 disadvantage.
Yes, so far each team has had one match because there are some new players so they need more matches to gain cohesiveness
Real Madrid is still above Barcelona for now. With Real Madrid's composition so convincing, they are also made easier because they don't have to bother overhauling the game because most of them are players who have been in the team for a long time. While Barcelona of course must create harmony between players first.