Looking for a workout routine for the gym

I'm a 41 year old male who's about 30 lbs overweight. Just joined my local gym and struggling with what to do. Right now I lift weights for 30 minutes and then ride the stationary bike for 30 minutes. I do this 1 hour routine 4 days per week.
Looking for the optimal workout routine to lose fat. Not looking to bulk up. I can be at the gym for 60-90 minutes, 4-5 times per week.
Would appreciate being pointed in the right direction.
PS- I know diet is a huge part of it, working on that as well. Thank you.

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