How to get on first of the month rent schedule

[Glen Whipkins]

We have listed our first rental and are screening applicants.  My question now is say we sign a lease agreement on the 10th or 15th or 20th of the month, do we pro-rate the first payment then the first full rent payment is due on the first?  Or do we collect the pro-rated amount for feb plus march as the first full month when moving into the unit?