What are the most important lessons you give a new sales employee to understand the culture of your organization & generate leads ASAP?

You need to ensure your recruitment process is robust and the right person arson has been employed for the job. In other words you need to validate  that the skills you require for the sales role are within the individual and can be unlocked. You cannot use a farmer to effectively perform the role of a hunter. You need to create an induction programme that introduces the individual into your company and enable the person to understand the ethos of your company. A tested lead generation training programme must be used to ensure the rightKPI's are achieved by the individual. Sounds like you need a  a training consultant to assist you.