If I do not have the software format that your project was originally recorded in there is a (fairly) easy way to get your audio files into any other digital audio workstation.
This is sometimes referred to as “printing stems” although “stems” in the professional sense can often refer to a submix of things like your drums (instead of just the separated kick track, snare track, etc.)
The important idea to grasp here is that whatever tracks your engineer needs to utilize should be bounced separately starting from the very first beat of the song, or Bar 1 Beat 1. This includes any silence at the start of the song as well, and the position of all tracks must have a common start point so that the timing between all the tracks is maintained.
To give your engineer full latitude over mixing, your tracks should typically be bounced without effects, unless of course your effect is inseparable from the sound creatively. Its typically better to take EQ’s and reverbs off.
Any software based synths should be frozen or bounced so that they are audio format. Midi can also be included as well, but midi without bounced audio will not sound anything like your source.
Also, it is usually nice to include a click track and a rough mix of your project. This helps confirm that the other files line up correctly.
SpliceBlog has done a really good job explaining this for various platforms: