It'll all be done over the Guild; thankfully, the dice mechanics in Alien are ridiculously easy.  Your character will have four Base Stats (Strength, Agility, Wits, and Empathy), equal to a number between 2 and 5, then a few skills that add onto that (so let's say I have Wits 4, ComTech 2, for a total of 6).  That number is simply the amount of d6 dice you roll.  A skill check succeeds if any of those dice come up as a 6; otherwise, it fails.

If you do fail a dice roll, you can choose to Push your Roll, letting you re-roll those dice, but raising your amount of Stress Dice by 1.  When you roll a skill check, you will then also roll separately for your Stress Dice (again, 1d6 per level of Stress)  A 6 still succeeds, so having some Stress actually increases your chances of success, as you'll typically be more alert.  However, if any of your Stress Dice come up as a 1, you will then have to roll for Panic, equal to 1d6 plus your current Stress Level.  The GM (me) has access to a Panic Table that has all of the various effects of Panic listed, but generally speaking, the higher that total is, the worse it is for you.

There are other modifiers, as well as various charts and tables that the players don't have to worry about because it's all behind the GM screen, but generally speaking, if you want to do an action, you'll just go into the forum dice-roller, roll some d6, try to hit 6s and avoid 1s.

Character stats are pretty simple as well.  I'll go over the full rules for character creation in OOC, but an example character would be something like this:

[color=LimeGreen][center][h3][b][u]RIPLEY[/u][/b][/h3]
[img]https://i.imgur.com/FCbQxAkm.jpg[/img][/center]
[hr]
[indent][indent][b]IDENTITY:[/b] Warrant Officer Ellen Ripley, USCSS [i]Nostromo[/i]
[b]CLASS:[/b] Officer
[b]STRENGTH:[/b] 3, [b]AGILITY:[/b] 2, [b]WITS:[/b] 4, [b]EMPATHY:[/b] 5
[b]HEALTH:[/b] 3
[b]SKILLS:[/b]
Mobility (AG): 1
Ranged Combat (AG): 1
Observation (WIT): 2
Comtech (WIT): 1
Command (EMP): 3
Manipulation (EMP): 2

[b]TALENT:[/b] Influence (You may Push any Skill roll based on Empathy twice rather than once)

[b]GEAR:[/b] SpaceSub ASS0-400 Harpoon Grappling Gun, M240 Handheld Incinerator Unit

[b]SIGNATURE ITEM:[/b] Jones, the ship's cat

[b]PERSONAL AGENDA:[/b] Your family life back home is in shambles, so you've become more protective of the family you've chosen aboard this ship.  Protect your friends at all costs.

[b]BUDDY:[/b] Dallas

[b]RIVAL:[/b] Ash[/indent][/indent]
[hr][/color]

There are a few other things to go over, but as you can see, it's pretty streamlined.

Gameplay will effectively be me taking turns as the GM describing the scenario, then each player will have one 'round' to post a response to the current situation.  Decide which action you want to take, then roll the dice accordingly in the forum's dice-roller (copying the link so we can see it's legit), then describe how that action succeeds or fails based on the outcome.