Need help making a work out plan

Hello everyone

I joined a gym last year with a friend and whilst we went regularly it was very much the blind leading the blind. We would spend some time in the cardio section; cross fit, treadmills and bikes, then do a virtual fitness class and then go across to the weights, where an older lady told us to stick to 5kgs for arms and 10kgs for legs (because we are female?) and that its more important to increase your reps rather than the weights (this wasnt a trainer, just another person using the gym) we took her advice.
My gym friend has now got a new job and has cancelled her membership and I havent really been back on my own.

I want to go back, I enjoyed the progress but I always felt that I never really had a proper work out plan.
I kept a log of our work outs and the last one I have written down was;
30 minutes cycling
30 minutes cross fit
30 mins abs work out virtual class
Legs all 10kgs; Leg press 5x15, Leg curl 5x15, Leg curl other 5x15
Chest Press 3x15 (10kgs)
Bicep curl 3x15 (5kgs)
Ab Crunches 3x15
Rowing machine 1000m
Sit ups: 30

Yes I would leave the gym feeling both energised and exhausted, usually feeling heavy ache in my upper arms later at work. (I work evenings so gym was always morning)

Should I go back using the above outline and just increase the time spent on each area? Or am I better increasing the weights and reps?

Thanks