If you don't want to bother with randoms in Overwatch, you can prearrange a squad using this well-designed LFG tool.
Find teammates and groups with this slick Overwatch LFG tool
Overwatch includes matchmaking for all modes, which is what most players will no doubt rely on to get into games.
For those who want to go in with a pre-made team, Reddit user elapse has created an LFG tool designed to do just that.
It's called OverwatchLF and it allows individuals to look for groups, or groups to look for more players. You can filter those with or without mics, and browse by platform for PC, PlayStation 4, and Xbox One.
The site also lets you to chat with other users whose listings you're interested in. Elapse is working on adding Battle.net support, better chat notifications and a better mobile experience.
If you've picked up Overwatch and feel a bit overwhelmed, don't be. A quick read of our guide will get you sorted.