Start by walking 1 km every day. Do that until it is easy. Then increase the distance to 2km. Then start to jog part of the way.
Depending on your physique you should be able to jog 2 km within a few weeks. Then you can slowly raise the distance to 3km then 4km then 5km.
It does depend on your physical starting point. But people close to a healthy body weight should be able to achieve a 5km run in 3 months.
Walking 5km is a pretty doable though.
I'm just so dang amped at people starting! WOOOOO!
Basically working your way up from "I can't run for longer than a minute" to "I can run 30 minutes nonstop".
There's a pretty fun implementation of it called "Zombies Run!!!" which does interval training with these audio stories where you have to run away from zombies periodically.
The important part is to develop consistency and not make it too challenging.