Are you serious? If the tubes don't hold air, get new ones. Watch a youtube video if you're not sure how to change a tube. The tires should be roadworthy unless dry-rotted to where there are big cracks or holes.
Test the brakes. If they grab, good enough. Very old brake pads do get hard and have little friction. If you need new ones, that's under $20 and you can install those yourself with ease. Lube the chain.
Then start riding. If you're riding paths 2x a week, what you have is more than fine. When you find yourself riding a lot and wanting a new bike, then get one.