the steps that I use for creating a db at command prompt
>prostrct create <dbname>
>prodb <dbname> empty
I usually already have a structure file in place named <dbname>.st
Then I go through DAta Administration to load my .df for the db an wha-la that's bascially it.
If you are talking about making an install script to create the db, what I do there is I will get a "master" copy of the db, one with either no information just the schema or with the minimal number of records created, then I use probkup to get the database all in a single file. In a script I will just run prorest to create the db from the bu file.