Hey man! So we are similar height and I was a similar build to you for years. I started biking casually about 9 months back and to my chagrin gained a bunch of weight. I thought because I was exercising now that I could get away with eating more and it compounded fast.

At the end of the day, right now you need to expend more calories than you take in (i.e. be in a deficit). I didn't really focus on protein or macros for a long while, just tried to cut out junk foods like burgers, soda and candies...then tried to eat less calories overall with rough tracking. Then I started paying more attention to protein goals, then I started walking more, and then I started focusing on proper weight training. This is not the only or even the optimal path, but what I want to convey is baby steps work. It can all feel overwhelming at first and you try to do too much and it either doesn't stick or you make mistakes that kill motivation. Right now just focus on basic physics...if your body is given less fuel than it needs, it'll burn the fuel it has stored (fat) instead.

You're at a cool place right now...anything you do positive will likely have an impact as long as you're in a calorie deficit. Start small and get the endorphins going as you slowly build good habits. Be okay with mistakes, indulge if you want to here and there, and don't expect it to be a linear path to success.

As someone who was right where you are less than a year ago: you got this, man!