Newbie create/configure question

[Lynn Jennings]

I got mySQL (server 5.7) downloaded and installed 2 days ago using only the default options. I have spent the last 2 days trying to get the program to do something, e.g., I enter:

C:\Program Files\MySQL\MySQL Server 5.7\bin>mysql_config_editor.exe
and I get a help message that doesn't tell me how I can create/configure a database!

C:\Program Files\MySQL\MySQL Server 5.7\bin>mysql -u root lmj03
ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)

mysqluc> create database lmj03
Unknown command: create database lmj03;
mysqluc>

I've tried YouTube videos and googling, but I can't get my installation to look like their installation!

Another tutorial starts by saying "From the MySQL command line, enter the command CREATE DATABASE <DATABASENAME>;. Replace <DATABASENAMEs> with the name of your database" but none my the command windows I've opened prompted for a password so I don't know if I even got a MySQL command line.

Please let me know of a reference that is so basic, I can be sure to create/configure a simple database.

Thanks!