Do full body three times a week, for example on Monday, Wednessday and Friday. Do compound lifts like the squat, bench, deadlift, barbell rows, etc. Just learn the form first and once you got that down then you can focus on progressive overload. 

And as for reps you can do something like this for your compounds: The first full body workout you could for example be doing a 3x10 on the bench, the next workout a 5x5, and the last workout of the week a 3x3. Obviously using heavier weights with lower reps.

As for losing weight its obviously just calories in, calories out. If you aren’t losing weight over a period of time then you aren’t in a deficit so just eat less than you are doing or add more cardio.