From my past experience, base pay is usually anywhere from $30,000-$55,000 dollars. That is not including any benefits such as health care, expenses, car allowance, laptop. Prospective employees who have more experience in sales would get a higher base salary DOE. Also if you have a product that has a long sales cycle or does not sell very fast or very well. you may want to adjust according to that. the point of a base is to keep you going until you can carry yourself with your commissions.
As a sales professional you should never rely on base as your main income. Those who do never sell much, and usually find themselves looking for a new job in 90 days.