You shouldn't feel stupid, it happens to everyone when they are new to a server! What you can simply do is join us.mcgamer.net. You can replace the us with au, eu, ca, and as(Australia, Europe, Canada, and Asia respectfully) depending on where you live. After you join right click the compass and choose what type of game you want to do. Let's use Hunger Games for an example. Simply click on the icon for Hunger Games and you will teleport to the signs. Either hold right click on a restarting lobby to join or right click on a sign that says [Lobby] and has less than 24/24 players. If you want to spectate, join a lobby with a sign of [LiveGame]. That's it and enjoy your stay! Hope this helps.
![Stick Out Tongue :p :p](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
If you need any more help feel free to ask me!