Narrate an online course

We are an Australian workers compensation insurer currently developing a suite of e-learning courses for our customers. We require an experienced and professional narrator who is knowledgeable in creating quality audio files for one of our courses (possibly more in the future). The course takes about 15 mins, so we expect the actual narrated elements to take approx 10mins. When applying, please also provide a sample audio file so that we can assess whether this is suitable for our needs.