The responsibilities differ from state to state, but typical duties may include setting up and preparing the polling location, welcoming voters, verifying voter registrations, issuing ballots, and explaining voting procedures. Poll Worker is a local position so you should contact your local election official. These are paid positions.

The National Association of Secretaries of State (NASS) provides information on becoming a poll worker for all states: https://www.nass.org/can-i-vote/become-a-poll-worker

The US Election Assistance Commission provides a link to the election workers laws for each state here: https://www.eac.gov/sites/default/files/electionofficials/pollworkers/Compendium_2020.pdf