Things that might help creating the music
In Ambient music, the layers work together synchronously – blending together to create more similar soundscapes. However, it’s quite common to hear subtle noise-based elements too.
Ambient music usually doesn’t have a detectable tempo. instead of using a rhythmic backbone, the musical parts may grow and die away, leaving space behind when they go which can be filled with new parts and textures.
The gradual fading in and out of different parts, colours – this is what gives Ambient its shape.
( https://modeaudio.com/magazine/ambient-5-production-essentials#.WHSmPnecaV4 )
Choose a point in the file that is the least busy section. Make an edit at that point. Then drag the “tail” end of your edit to a new track as the starting point and the “front” end of your edit point onto a new track as the new tail.
( http://www.playdotsound.com/portfolio-item/tutorial-how-to-create-seamless-looping-music-and-sfx-files-for-video-games/ )
Experimenting with sounds: