If you know the syntax, here are the steps.
1)Create database with system datafile of sufficient space.
2)Create USERS,TEMP,RBS tablespaces and Public Rollback Segements and run catalog.sql, catproc.sql. ALter system user defaulted to users and temp tablespaces.
3) run the rest of the scripts CAT*.sql, DBMS*.sql, UTIL*.sql depending up on the options you wanted on the databse.
4) Create DATA and INDEX tablespaces for your data per requirement.

Thats it pretty much.