I can't comment on how much you should do, but here's what I do:
Mondays 4o minutes cardio. (incline walking)
Tuesday: 20 minutes weights (chest, by's & trys) 3 sets x 8 reps), 20 minutes cardio
Wednesday : 40 minutes cardio in Arc Trainer
Thursday: 20 minutes weights (abs, back & legs) & 20 minutes cardio (elliptical)
Friday: 20 minutes steady cardio, followed by 20 minutes HIIT cardio (30 seconds flat out+90 seconds recovery).
week ends rest.
I'm 64 male, joined the gym last August, (258 lbs), I'm 231 lb today, with target of 225 for 1st week in March 2018.
You will notice I don't run : I've had a total knee replacement, the impact is not allowed!
The weights on Tues & Thurs is to maintain muscle mass.
I used MyfitnessPal app to track my calories & exercise (from my fitbit) to maintain 500-800 calorie deficit each day.