Changing pay date cycle

We are moving our employees to a new pay check Friday.  So to do this; we are going to pay them all a 1 week check just once. Then they will be on a new 2 week check cycle after that. I know I need new pay plans for the new 2 week pay schedule and to attach it to all the employees. Has anyone done this before (changed check cycles and created a 1 week check)?  I tested BN150 and even though on the BN150 I put a 1 week range in the beginning and end date fields; it still calculated on 14 days (probably because we are bi-weekly on HR11 pay tab). Anyone had experience with any of this before? Thanks!