It all depends on which specific perennial that you want to grow.
Different perennials require different germination conditions.
Some need moist warmth and some need a chill and so on.....
To start maybe pick 5 to 10 perennials that you would like to start and then people here could give you advice on the germination for each one.
Or you could search the data base for them-------some do include germination advice.
Good luck and keep in touch with us.