How do I start car sales and not be predatory and also sell something reliable?

I’m going to be starting car sales tomorrow at a Honda dealership and I’m worried as a Christian that I could start off the wrong way. I don’t want to do predatory deals and give someone a vehicle that won’t last and will need constant repairs. I don’t know where to start doing research on the vehicles to make sure I’m getting the correct information. Anybody have advice as a Christian sales person or even just someone who has integrity and morals? I don’t want to take advantage of people or to feel guilty after a sale and wrong somebody.