So, I do have a normal routine that I like to stick to. I workout 6 days a week and I’m usually at the gym at 4am, before work, and usually for about an hour. This may not work for you, and that’s ok. I’m just sharing what I’ve found works for me.
I’ll typically target two muscle groups per session and make sure I don’t hit those muscle groups for 48 hours. My routine varies, though the muscle groups stay consistent. I like to switch up the exercises that I do for each muscle group, so there are probably at least 10 different methods/exercises (more or less) that I'll employ for each group on any given day. I’m currently pretty happy with my body and strength these days, so generally my workouts are more maintenance than anything, so I’m pretty consistent with the weight that I use, but, for growth and/or weight loss I always recommend starting off with a weight that gives you resistance (in other words not something you can lift too easily, but not something that will tire you right away either) and doing 10-12 reps, then gradually increasing your weight for 3 reps. Your last 2 reps should be pretty heavy weight and you should max (fatigue) the muscles.
Normal Routine:
Sunday- Chest/Back
Monday- Legs/Shoulders
Tuesday- Bicep/Triceps
Wednesday- Chest/Back
Thursday- Legs/Shoulders
Friday- Bicep/Triceps
Once I’ve found that I feel as though I’ve plateaued (body has stopped responding positively to workout routines, lifting is less challenging) I’ll move on and do 2 important things.
October; Chest
Sunday- Legs/Shoulders
Monday- Chest
Tuesday- Back/Shoulders
Wednesday- Chest