I have to admit, that I´m quite a beginner. So I was quite confused about the black queen moving to e7. How should I react?

nc3,nc6,nf3,nf6.o-o,pd6,re1----black is thinking of qb3,which u should not do.

My first guess is to be happy Black may have made a bad move and then play Nc3.

Sounds good. Thanks a lot!

Here´s another move, I did not exspect, which is putting me in trouble: 

C7-C6 is putting me in kind of trouble. What would you recommend?

Qb3 looks strong enough.. or perhaps just Nf3

I tried Qb3. The problem is, that after Qe7 my pawn is blocked and black might come up with pawn d5.

c6 just looks awful, white sacrifices two pawns to bring his pieces out, black plays a move that doesn't develop a piece and actually stunts development?

Just get your pieces out. Nc3 again, Nf3, probably both good.

And as I understood the danish gambit, the focus is to make pressure and not loose tempo. 

Remember if you are lucky you can win against a grandmaster with a two pawn sac in the opening.

Here's a simple line against the Danish. It's been used countless times in junior tournaments against players whose coaches think the Danish is a great line for scholastics to learn.

The Danish is a good line to learn and to play in casual games, but not so good to use in serious tournament play.

http://www.chessgames.com/perl/chessgame?gid=1028156

Ok. Looks like I should go for different openings. Thanks anyway!