In his waltzes, the left hand provides the heartbeat. Practice the left hand alone until the jump from the bass note to the chord feels like second nature.
To find the right sheet music, you should decide between (which are shorter but require intermediate skill) and simplified arrangements (designed specifically for beginners).
While Frédéric Chopin is renowned for his technically demanding etudes and concertos, his repertoire includes several pieces accessible to early-intermediate players that capture his signature "singing" style. The Myth of "Easy"
For true beginners, there are many "Easy Piano" arrangements that strip away difficult octave stretches and complex runs while keeping the beautiful core harmony intact.