Start slow and LOW. Don’t compare yourself to marathoners: it’s not a goal you should be focused on right now. Start with something much smaller, like being able to jog 5 minutes straight. And believe me, that’s hard at first!
There are loads of apps/programs to help you ease into running: I’ll add some links below! You’ll start by alternating intervals of jogging and walking: short jogs, longer walks. After a few weeks, you’ll add longer periods of jogging with shorter walks. Maybe a few VERY short sprints (a little faster than a jog), followed by a walk. You progress slowly over time, and at first it’s better to limit your runs/jogs/walks to 3 times a week. The biggest issue with newbies is injury: it’s new movement for your body and it needs time to build strength and get used to it.
Another way to build up to it? Set a playlist for 20-25 minutes, with decently fast paced songs. On the chorus, jog. On the verses or bridges, walk. Some choruses are longer than others, some verses shorter, so it does provide interesting intervals for you.
Expect it to take awhile! I know we all LOVE quick results, but it is NOT the way to go. If you’d like to be able to jog away next summer like a boss, you need to start slow and build up to it. You’ll still get a great workout, and get better at it over TIME.
You can also split up your runs with a circuit. The Shedder is awesome. All you need to do is run one lap. Find a park, a track or even around your street. Then you do a quick circuit and repeat. The jogging interval is fairly short and it gives you time to recover while you’re working other muscles.
Here are some links to beginner running plans! Important: push yourself, but scale it back to your level if you need to. Also, don’t RUN but jog lightly at first: it’ll help with your heartrate and pacing yourself. No need to hit the ground ‘running’ so to speak. :)
Hope this helps!