Approaches to Commission Pay for New Sales Reps: Share Your Thoughts

What is your approach to commission pay for sales reps in their first and second months? Should companies offer ramp-up support: yes or no? 1. Pay full commission, even if they did not meet their targets. 2. Pay a percentage, such as 80% of the commission, even if they haven't met their targets. 3. Do not pay any commission without performance. Thoughts on this?