I connect to database quite rarely (over the console). So often I forget simple things. This is my start for PostgreSQL database, you just installed it (9.4 version).
I will use console commands.
Create user and database:
--no-createdb - The new user will not be allowed to create databases. This is the default.
--no-createrole - The new user will not be allowed to create new roles. This is the default.
--no-superuser - The new user will not be a superuser. This is the default.
--pwprompt - If given, createuser will issue a prompt for the password of the new user. This is not necessary if you do not plan on using password authentication.
UPD: Remove user