Five pounds are terrific for beginners! And, depending on how you feel, no dumbbells or lighter dumbbells work well, too. Strength training workouts vary tremendously by style. Take your cue from each instructor in each specific video. For example, Ellen Barrett rarely (if ever) goes over five pounds, even with her advanced pupils, whereas Ellysia Noble might nudge you to try heavier weights. Here are two collections you might enjoy:
https://grokker.com/fitness/collection/strength-and-cardio/603fff68b356ab7d31b99cbc?page=6
https://grokker.com/fitness/collection/ellen-barrett-jane-fonda-denise-austin-gymra/603ad1c4b356ab7d31b48e73