You should keep the members informed throughout the process. They need to know what they have won, or why you had to settle for less or drop the demand entirely.
Even if you do not win a program at the formal bargaining table, it may be possible to win it in another forum after the ink is dry on the agreement.
If you did win, get ready for what is sometimes referred to as "continuous bargaining." There might be more negotiating trying to get the program up and running than there was in winning it.
An on going joint labour-management forum where decisions about setting up and running the program will need to continue or be established once the formal negotiations are completed. It will be critical to the success of your program that the structure, representation, authority and working processes of this forum ensure that the union is truly an equal partner in this endeavour.