This guide is for who wants to create a server to play with friends for a few hours or so.
The intent of this guide is to create a droplet, set it up, play, turn it off, create a snapshot and destroy the droplet.
First of all, you need to create an SSH Key and add it to your account, click the following link on how to -> https://cloud.digitalocean.com/account/security
Then, create a new droplet (I choose a Standard $20 Droplet and it should be fine to play with a few friends).