Regarding strength training...
I recommend Gym Genius for an app. You can create your own program and track your progress. I use it exclusively now.
For workouts, I'm a firm believer in total body strength - absolutely NOT doing things like working this one body part or that. That type of exclusivity lifting is only for the most advanced lifters who are already well developed and need to bring one part up to par with the other parts. So, stick with compound lifts for now.
Perhaps look up a good 5-3-1 program to follow and don't neglect flexibility.