This guide will encompass basic information that you need to know in order to start out on this server
Keep in mind, there may be other similar threads like this, and the wiki (of course) to refer to instead, so I will try to make this unique
--> When you start, you will start out near a Sleeper, dressed in undergarments

-First of all, you have to go the cafeteria, use the vendors, and eat some food (until you aren't hungry anymore)
To reach the Cafeteria, you have to go southeast to the showers, and south through the airlocks further down

-When you spawn, you will notice that you move slowly (due to hunger);
if you have eaten sufficient food, you will start moving normally (your speed also depends on whether you're walking/running)
-Check your ID and see which squad you belong to
Go to that squad's room, open a locker, and suit up (make sure to replace your undergarments with a uniform)

- Get out and go to an equipment vendor

This is where shit gets a little tricky
There are various weapons to choose from:
1.) A throwing knife- Personally, I don't use it much, but it is pretty useful to carry a few if you run out of ammo
2.) A combat knife- This is a must-have for any marine. Click on your boots with it in your active hand to sheath it there, and click on your boots again to unsheath it
3.) A shotgun- You need to carry it with both hands, pump it, and load each shell individually. It fits on your back slot, and packs a punch against less powerful Xenomorphs

4.) A pistol (M4A3)- You can fit this in about every spot on your body; low stopping power, but it's good for a fall-back weapon, or for killing Facehuggers

5.) A revolver (Magnum)- Basically the pistol's big brother; much higher stopping power, but lower rate of fire, and only 7 bullets capacity

6.) An assault rifle (Pulse Rifle)- A great weapon, moderate damage, 30 round capacity

7.) An SMG- 35 rounds, but low damage. Good for Specialists and marines who know how to use them

- After you've taken everything you can, make sure to load up on as much ammo as possible
You can put ammo in belts, pockets, armor, and backpacks
-->After all is done, get out, go back to the cafeteria
Take a left until you are in a large room.
If you joined earlier, wait in the room in the seat row with your squad's color
(Check the color of your gloves)
Wait until the Commander comes and starts/finishes briefing, and then leave when the eastern-most airlocks open
Click on a ladder to climb down, wait a couple moments...
-->When you're on the lower level, walk to the dropship, get in, and buckle yourself to a chair (click and drag yourself to a chair while on it)
-Wait for the shuttle to launch, and when it does, good luck!
This literally just the basics to setting up a loadout, but I only have one tip:
If a facehugger (tan scorpion looking thing) takes down a fellow marine, remove it from the poor bastard.
If it's too late, take it off, and drag him back to the dropship (ask for it to be sent back over radio), and wait for it to get to Sulaco. Take him to medbay, and do so quickly
If anything info is wrong, correct me