First things first, open Minecraft and connect to raid.mcpvp.com There are two Raid servers to support more players, but they are both essentially the same. One is based in the US and the other is based in the EU. By using the main IP, you will get placed in the server in your region.

Once you've joined the game, use the command /help to receive a book that goes into detail about everything you need to know. If you've never played before, it's a good idea to read through the first few pages about starting out on the server.

Note: It says "0/0 players" but the server is online and you can play it!