Let's say your ducting is well done for zoning. Don't forget to add a by-pass damper as your blower has probably a 5 speeds motor, hence when you close a damper, all the airflow will blast out from the other zone (and imagine you got a small zone on that, you might hit the upper limit and get the system to shut down).
Let's say you know all this stuff and go ahead, make sure you don't buy random damper motors without having the right control board too. Some control boards aren't compatible with some dampers (as with the Carrier system, they need their own dampers/motors).
So basically, if your ducting setup is ready to accept the zoning, what you will need is :
1 control board (verify how much zone it can accept, some are limited to 2-3)
X Dampers mounted with their controls (motor and stuff)
X thermostat to fit the amount of dampers you've bought
Usually one transfo is enough, but it all depends on how much zone you're gonna hook up.
1 By-Pass damper (you need to calculate how much flow the smallest zone is giving and then substract the total CFM of your blower from the rest to size the by-pass to use to maintain a good static pressure)
My suggestion would be to go with EWC control or Honeywell.
The electronic static pressure damper from EWC control is awesome (SBD-10, SBD-12, SBD-14,...)
Have fun.