I want to develop some RTS/simulation game. Therefore I need a camera perspective like one knows it from Anno 1602 - 1404, as well as the camera scrolling. I think this is called isometric perspective (and scrolling).

But I honestly have no clue how to manage this. I tried some things I found on google, but they were not satisfying.
Can you give me some good tutorials or advice for managing this?
Thanks in advance