I need some help from the bike forum.

I am 57 years old and want to get back to doing some bike riding and have questions on my tires.
I am 6’4 and weigh 375 pounds and would like to know what type and size tires and tubes I would need for my bike. My
Bike has 29in rims and the tires I have right now kind of work but I think I am stressing those babies out. I would like to ride 5 or 6 miles without the worries of a getting a flat or damaging my rims. I would mostly be riding on blacktop because there is a 20 mile bike and joggers trail right next to where I live.
Thanks for the help