Is my website configuration ready to go live?

I want to know if I am missing something or no.

I have: 512MB Ram 20GB SSD Disk Singapore 1 LEMP on Ubuntu 14.04 I am building a simple PHP application.

I have done:

1. LEMP one-click app installation

2. initial server setup I wen to this link and applied all the things in the tutorial (Create new user, gave it Root Privileges, changed ssh port, disabled root login).

3. key-based authentication After doing that I have disabled login using password

4. installed ufw firewall I have closed all incoming and outgoing ports. and the I have opened the ones I need until this post and those are: 2222/tcp(ssh port and sftp) 80/tcp 2222/tcp (v6) (ssh port and sftp) 80/tcp (v6)

I will be openning more ports when needed. For example if I need to use something that uses port XXXX then I will open that.

5. mysql_secure_installation I have done this and I have added a new user to not use the root.

Now my question is:

• In step 4, Do I need to open more ports In the firewall? Some ports that are necessary to be open before my website goes live.
• In step 5, Do I need to disable root in mysql or it does not matter? Or just using the other username with all privileges in my application is fine?

And the most important question, Am I missing any other setup before going live?