You'll need 1 pair of lighter weights (something between 10 - 20 lbs) and a pair of heavier weights (20 lbs +) in case you want to switch to something heavier.

You need 1 pair of lighter dumbbells (something between 5 - 10 lbs) and 1 pair of heavier dumbbells (something between 10 - 20 lbs)

You need two pairs of dumbbells. Something lighter (between 5-10 pounds ish) and something heavier (between 10-20 pounds ish)

You need: a heavier pair of dumbbells (something between 10 - 20 lbs). Grab a pair of lighter dumbbells too (something between 5 - 10 lbs) in case you end up wanting to go lighter.

You need 1 lighter dumbbell (something between 5 - 10lbs)

You need: 1 lighter dumbbell (something between 5 - 10lbs) and 1 heavier dumbbell (something between 10 - 20lbs)

You need: a heavier pair of dumbbells (something between 10 - 20lbs)

You need: 1 lighter dumbbell (something between 5 - 10lbs)