Self Challenge : 1 year to lose 100 lbs AND KEEP IT OFF

Former athlete in HS/College, used to work out a lot. Got a desk job, a wife and a kid and let myself really go. Now 43 and just back from vacation and hit an all time high in weight. I would like to lose 115-120 total but am starting with a year long challenge to lose 100.
Tracking everything I eat, just bought a treadmill (delivery in a week and half) and plan on working out with freeweights + cardio on bike (stationary and road) and walking to running on treadmill and road....

It's a long journey ahead of me to meet this challenge, but I'm committed to get to a healthy place for my family and me. I recognize this is not a diet/plan but a lifestyle change. I will make it happen.

Looking for friends for inspiration here. Feel free to add me.

Thanks,
E