What weight range should I look for as a beginner?
For most beginners, a set adjustable from 5 25 lbs per dumbbell is a good starting point. Women often start with 5 10 lb for upper body and 15 20 lb for lower body exercises. Men typically start with 10 15 lb for upper body and 20 25 lb for lower body. If you plan to progress seriously, investing in a 5 52.5 lb set up front saves you from outgrowing a lighter set within a few months.
Full guide: Best Affordable Adjustable Dumbbells: Replace an Entire Rack