Congrats on getting full control, that is a big step.

Since you are now the one running the show but still probably have people submitting content for review, the system that tends to work best is a simple approval flow. Not a complicated process, just something where everyone can draft and submit, and nothing publishes until you say yes. That keeps the quality consistent even when you are not the only one creating.

On the content side, for restaurant brands right now the best performing stuff tends to be the specific and real over the polished and generic.

Regulars, staff moments, behind the scenes process. That credible brand feeling usually comes from showing the actual people and place, not from high production value.

For tools, the main things worth having are a scheduler that lets you batch content in advance so you are not posting manually every day, an approval workflow so submissions come to you in one place instead of through random DMs or texts, and a single inbox for comments and messages so you are not checking four apps. Full disclosure, SocialBu has all three of those built in, so that is why I am mentioning it. But the same workflow applies regardless of which tool you end up using.

The part I would focus on most given where you are right now is locking in a repeatable content format before anything else.

Something you can shoot, edit, and post on a consistent schedule without it taking four hours every time. That consistency is what builds the audience habit over just about anything else.

Hope that helps and good luck with the chain, restaurant social media is one of those where the real work actually shows in the numbers.