Just so you guys know, I was in the Navy so I'll probably bring in a lot of the slang and at least for the alliance crew bring in a lot of the traditions that are typical on a ship and rank courtesies and such.
Another thing I wanted to bring up in regards to smuttiness. Relationships, flirting, anything goes, crew members can date or flirt (or have sex) with other crew members as long as both members are ok with it. (So if one of your characters wants to end up involved with someone else' character it's ok as long as you both agree to it, actually I'd encourage it, partly because if the LI crosses over from part 1 to part 2, it'd make for good reunion scenes.)
That being said, Raven is available, I kind of want the whole Commander LI thing like in the Mass Effect games. Raya Vos however is not. (I'm only bringing up my commanders to each crew, NPCs and my other characters will express their opinion only if someone shows a romantic interest in them.
On another note, though I listed probable recruitment order, this is NOT set in stone, like if your character is in the same place as the squad is and it's not a 'recruitment mission' I'm not going to say "No, they cant join until I say so!"
I'm not including ALL the missions for the sake of simplicity, as well as avoiding spoilers, but here's how the Mission will pan out in regards to recruitment missions.
Citadel and Arcturus Station, the mission begins, first members are recruited.
MSV Tomahawk, the damaged frieghter were a mysterious signal was sent out to an unknown enemy
The Team learns their enemy is working with the Geth, they are sent to a colony to prevent an invasion.
ThOne of the colony survivors is a Cerberus opperative and escapes with valuable data, the team Chases them to a Cerberus facility.
New leads surface leading the team to Omega and chasing down a Slaver named Gen Tannik
The Next lead has the Team chasing down a Krogan near Tuchanka
Certain characters are tied to certain plot points but most of you can jump in at any time to join the squad. As I said before, you dont have to wait around until the plot point where your character joins the squad, I'll make use of NPCs so you wont get too bored, so just jump in when ready.