Looking for workout routine

What's up, trying to get in shape by working out. I've been really lazy since cross country ended last winter and haven't done any serious committed working out since. I'm looking for a good weekly workout routine that combines running and going to the gym. I'm an 18m that currently weighs about 165 lbs. My most important goal is to live a healthy lifestyle, but I'd also love to replace my chub with some muscle. I'm currently in college so I have free access to the gym and plan on going there 3-4 times a week while running 2-3 times a week. However, I don't really have a plan for what workout I would do at the gym. If people could recommend a workout plan that would be suitable for me or even show me a place/website/app where I could find this it would be much appreciated!

As for what my workout plan currently looks like, this is all I got:

Monday: core/run

Tuesday: Leg Day

Wednesday: Light run/break day?

Thursday: Run

Friday: Upper body

Saturday: run

Sunday: core

Any/all advice is greatly appreciated, thanks! Feel free to ask questions too!