How do I get the same volume in different parts

I am working on a radio programme, which consists of 5-6 elemens: Different interviews, music and studio speak.
What is the best way to get the same volume for the whole programme/all the elements? Is the compressor the best tool to use - or?
And do someone have a short and simpe guide how to set all the settings for the compressor?

The best way is to keep each element on separate tracks, then you can use the track gain sliders to adjust the level of each specific element.