Ask yourself why those characters wants to help clan ventrue. Because they were saved by one of them, because they owe they money, because they want to make a business and clan ventrue can help them. Start from there and then you can create little stories for some groups. Perhaps the ones that want to make a business are three or four associates, and they knew themselves at the economics university, or they used to play golf together If a Ventrue saved them perhaps some of theme where family and were in a car accident. Etc, etc. Others pnj could be family or friends of these detailed before....