A few ways to get a group together at the start of a game:
1) The group's already together when we join them in media res. Later on, you can flashback to how they got there.
"The troll (that's your character, Steve) presses his massive body to the heavy door, holding it closed as the ghouls claw at the outside and the mage (your PC, Dave) kneels over the badly injured man, staunching his bleeding and and preparing him to move once the hacker (Alice's PC) finds a safe path out of the barrens using the drone she's hacked."
"Steve, give me a Strength plus Body test, Dave, roll First Aid or Heal, as you prefer, to patch up the package for extraction. Alice, give me a Hacking and Exploit test."
2) The characters are left the only competent and effective people in a situation where action must be taken to preserve their own lives and the lives of others.
"The ride on the subway car is peaceful and a fast way to get where you need to be in the Seattle evening until it suddenly starts to slow as the interior lights fail. The breaks shriek like a lost soul in the sudden darkness and the sudden stop sends a pregnant young woman sprawling past your hacker, Alice. With an initiative test that beats 9 you could catch her and stop her from falling. Dave, no less then three people pile into your troll, roll a body test to keep from falling down. Steve.. your ok, no problems."
"When the car stops something starts clawing on the outside of the train. You can each see two other people that look like they could defend themselves, and about five that can't in a scene lit only by neon tattoos and fiber optic hair on a scared looking elf."
Or..
3) Start them in a bar when a mysterious Odinic wanderer enters with an eyepatch and bot-raven on his shoulder, asking them with humble good humor to indulge an old man a moment while he buys them a drink and offers them a job.
