Actually, in my campaign, we started at 5th level, so the party members had been working together for a brief while.
It was the first time I DMed, and the Adventure was the basic 'Hire to go get something' starting, so I could gauge the group.
But, for low level... Hm. Having a PC knowing the other is good. Perhaps an NPC tries to hire one PC (A mage, or noncombattant character) and the NPC suggests that he hire a bodyguard, or some assistants. The NPC will pay them, but the person's reward will be divided amid all those he hire.
This will let the PC find the others, and get some RP in before the adventure.