Are you familiar with the HEI condenser standard?
I would suggest that you read through it, and then look at a package for an existing plant.
You will see some things that they added, and some that you wish had been included.
At its most basic all that you provide is inputs, steam flow and enthalpy, water flow available and seasonal temperature information. While that is technically enough you will want to spec a lot more.
= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, Plymouth Tube