I've been a Pro Tools user since I started editing and mastering audiobooks well over a decade ago. So I'm not able to offer tips and tricks specific to Audition.
But what I do know: it's /not/ about what software you use. It's about the quality of the audio you record. The room, microphone, body position all play a role in how the audio sounds.
Sometimes, people think post-production is a panacea and that they can rely on the editor to fix any problems. While technology has changed over the years and we can fix more of the issues, the key is to get the audio right from the start.
What I can offer: an experienced ear. I must be approaching a number well into four digits for the number audiobooks I've worked on so far. I've heard it all: big or small rooms, good mics or bad, good microphone technique and bad.
What I propose:
1) We'll go through 3 rounds of recording 3 to 5 minutes of audio to get your microphone and recording space set up so the best version of you makes it on tape. We'll also talk about things you personally can do to make the audio better narrator-wise.
2) Once we nail down a recording setup that works great, we'll talk about the settings I would use if I was mastering your audio. This could be settings for a compressor, EQ, noise reduction, gate, etc.
Feel free to send me a private message with any questions or if you want to hear about some of the audiobooks I've had the privilege and joy to work on.