1. As a basic firewall rull, allow login with "admin" only from your local network, Allowed address from 0.0.0.0/0 to something like 192.168.88.0/24.
System => user, double click admin.
2. You can change your login name.
Add your own username to your router with same rights as admin(full) with winbox.
System => user => +
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In winbox, you simply click "New terminal", a terminal pops up and you can use copy&paste these codes in #8 to build you firewall rules. Firewall works according to these rules. Script is saved in a file(winbox: system =>script) and executed by schedular or by hand.