Some sales programs will work on particular customer skills for retail type outlets or stores. Other sales program may focus on e-commerce and internet sales, presenting and selling products wholesale or even international sales strategies and techniques. Very few training providers can offer all types of sales training and using more than one training group is often essential.
Sales training needs to be done by people that have actually experienced the profession, both the daily reality and the challenges as well as the benefits. Avoid trainers that have a great education but little life experience in the field as they often don't understand the reality of working in sales.
How much time you wish to dedicate or commit to sales training will most likely depend on the type of product that you sell and the potential benefit that you will receive for completing the training. Commissioned sales people are more likely to attend trainings than salaried employees.
