Managing configs through Git

I have the opportunity right now to start a change control process managing switch and firewall configs via gitlab. I will be honest this is the first time I've had this opportunity. I'm not sure how currently but we have something in place that can TFTP a config change made through gitlab. So how should I approach this?

I am the only network guy. They can set it up so that I have to approve any changes before they're committed.

So how should I approach this? I've never used git in my life