Unless you’re at a pretty high level, I’d start with the free plans Garmin offers with their watches. Someone else already mentioned it, but it’s the daily suggested workouts.

If you don’t have a Garmin watch, then you can buy some nice programs through training peaks that displays through their calendar and can sync with pretty much any fitness watch. I think runners world has a handful of their programs on there for like 20 or so dollars.

I’ve seen a lot of people talk about an app called Runna recent that’s suppose to do your programming for you. Haven’t used it, but if it does what it says on the box, that also may be a good option. Runna is an ongoing subscription though.

Welcome back to running!