This is by far the best tactic I've ever created and I thought it would be worth sharing.
I made a video covering the most important things using this tactic.
I've had a blast using this system, very high possession, creating a lot of chances and a team where everyone is fighting for everyone.
You should be having around 55-70% possession and create around 20 chances per game (but often more). If you don't reach the same stats there's a chance your players aren't as technically skilled as the ones in Arsenal.
It's worth noting that this tactic will be suited towards teams with skilled players and not that well suited for lower divisions.
If you have any questions regarding this system, feel free to ask me and I will hit you back with a reply.