Not bad for a beginner.
Why wouldn't you be putting much stress on them? I would think as a beginner you would be putting more stress on your muscles as they are considerably weaker. Don't wimp out on the weight just because you are a beginner. 48 hours of rest between worouts is a good idea though, but not a necessity.
By my estimation you are only working each muscle group once a week? That doesn't sound like enough to me.
You could do your workout a few different ways. You could:
Day 1: Upper
Day 2: Lower
Day 3: Energy work
Day 4: Upper
Day 5: Lower
Day 6: Upper again or whatever, just not lower
Day 7: Rest
or just do a few full body workouts each week. As others have said, there is no catch all that works for everyone. You do need to work each muscle group at least twice a week.
They don't speak english anywhere in Europe? I thought your english was fine.