My experience with voiceovers are specifically for various radio ads for small businesses. I have also wrote the ad as well as performed the voiceover for same.
Types of business include coffee shops, restaurants, local automotive outlets,insurance carriers. My experience includes hosting a radio program at a local radio station in Naperville, Illinois. (WBIG 1280AM).
Experience comes from radio station background, as well as, knowing how to sell based on my many years in sales; knowing how to convey a message in a believable manner. Training consists of mainly on the job.
Abobe Audition 3.0.
My sales background is probably my best resource when doing a voiceover. When I would talk with a potential client, I would get from them what is important for them in an ad to convey to the public. I would bullet point those qualities and values, then copywrite an ad in a concise manner and complete the voiceover for that advertisement.