I am confused about the reps/weight/sets etc. Would any of you experienced cyclist/weight lifting ladies be willing to share a basic workout that I should do (I'm 46) ? I want to work the body parts that don't get attention when I'm cycling, and maybe strengthen my legs (at least in the winter) - I want to define and sculpt. Should I use a weight that fatigues my muscles after 8 reps, 12 reps, 20 reps?

Should I do more sets/reps, lighter weight, or heavier weight, fewer reps/sets.

I know the basic lifts I should do ie bicep curls etc. Just not sure how many, how heavy, etc