4 Day Split Calisthenics Suggestions

[Jeffhuu]

Hello,
I would like suggestions for a 4 day split using calisthenics.
I'm 6 foot 4, 300 lbs, 53 years old, a widower, and my goals are to lose weight and gain muscle. I'm just starting back after a year layoff. I'm starting with the flat belly workout until I get a better workout. I've been lazy and felt defeated far too long. Exercise is helping me be who I was and I don't want to grow old and helpless. I just want to grow old gracefully and remain independent. Can't do any pull ups yet and I'm struggling with push ups with a grand total of 5.
I'm open to any suggestions. I'm also looking to be a trainer and I figure that I have to walk the walk before I talk that talk!