I suggest to use packages like floatrow or »subcaption« (shipped with caption) to arrange sub-figures. For a landscape figure that occupies a whole page I suggest the sidewaysfigure environment from the rotating package.
But now I recognized, that I do not want to have a seperate page for the images. I also want to have text on the page, but this should not be landscaped.
And also the figures are not rotated yet. Can you fix this for me, please?
Edit: I accepted, that it is stupid to use a landscaped figure and normal text on the same page. My question was answered, I have a new approach so I'll open a new thread for that. Thanks again, Thorsten!