For any decision or adjudication, ask yourself, "Is this going to be fun for everyone?" and "Is this going to lead to the creation of an exciting, memorable story?"
DMs: Dungeon Master 101 | Session Zero | How to Adjudicate Actions | No Myth Roleplaying | 5e Monster Index & Encounter Calculator
Players: Players 101 | 11 Ways to Be a Better Roleplayer | You Are Not Your Character | Pre-Gen D&D 5e PCs
Content I Created: Adventure Scenarios | Actual Play Reports | Tools | Game Transcripts
Follow me on Twitter: @is3rith
I ask the players how they met, and expect them to have worked this out during character creation. I let them know this while building PCs, and generally that works fairly well. Usually one or two players doesn't fit, and I just try to get enough out of the backstory that I can come up with something to bring them into the main group based off of that.
The game almost always starts with the group knowing one another unless their meeting is some important plot device. If it is, I tell them this when desigining a character.
"In a way, you are worse than Krusk" " As usual, Krusk comments with assuredness, but lacks the clarity and awareness of what he's talking about"
"Can't say enough how much I agree with Krusk" "Wow, thank you very much"
"Your advice is the worst" "I'd recommend no one listed to Krusk's opinions about what games to play"
Use Dungeon Dice http://dice.ajb.bz
Best Basic OSR Clone, SimpleDnD