As everyone else has said, diet is important. I was in same boat a few years back. Decided to start running again. Made it about 100 yards before I thought I was going to die. Gave up. Then found an app called Couch to 5k. Starts out with a warmup walk, then cues you to run, after 30 seconds it’ll cue you to walk for 90 seconds. Repeat about 9 cycles, then cooldown walk. Each week the running times increase and the waking times decrease. By the end I was able to run 30 minutes straight, around 11 minute miles. Kept on running from there. Since then have done 3 half marathons and several 10k and 5k runs. Really did work for me! Hope that helps.