Research. Sometimes, it's hard to know what to research…or rather what questions to ask Google to get the answers you need to create a believable character. You'll get pages upon pages containing your keyword and then you have to sift through to find reputable sources that actually sound like they know what they're talking about. I always like to make sure the information I'm using can be verified on a few different sites, especially if it relates to mythology and culture. Since most of A Dying Gift focused on the interaction between Kian and Tyler, I didn't feel the need to go into detail about exactly what Kain did for a living. He was a wealthy businessman. However, Tyler was a different story. I didn't go into a lot of detail but I wanted him to have a profession that allowed him a great deal of flexibility of hour and I didn't want him on the phone all day, so I researched what types of jobs could be done at home that met my criteria. Once I decided he was going to be a translator and voice actor, I researched the training one needed to do those sorts of things, then voila, hot voice actor! Some books will require deeper research, especially if they're set in different states or countries. I once asked an author friend of mine what things she researched when she used a city she wasn't familiar with. Her response was "Everything!" and I still follow that today. Nothing will ever beat living in the place you're setting your story and being able to visit said city would come a close second, but if neither of those are viable, research is one of your best options!