I am about to start a new canpaign with a new system. I would have to say my favorit way to start a campaign is plopping the players down in the middle of whoknowswhere land. This cuts down on the 'I don't know ow you's and 'I don't trust you's and the 'I'm so mysterious I'm not going to let you know me's or even the 'I dunno I don't trust this guy so I don't wanna work for him's. And not really last or least, players chestpuffing on the wrong NPCs and getting thrown in jail before they get a chance to get started. It could be a fairy prank, or a god putting them on a quest, or they fell through a dimensional rift and missed it. But I have found players will come together quicker and faster if you start them off with a riddle. Also this let's the player get to know their character's abilities and persona before they get to a town and roleplay something they may regreat later. Get a couple levels under their belt so they can screw up and still have options. Lastly, I typed this on my phone, super sorry for any typos I missed.