Have you read
$1? It’s really comprehensive. The best advice I could give is all already there. But while anyone who wants to unionize their store has my full support, it’s also worth knowing that it normally takes a looong time for a newly formed union to see real benefits. The union can’t just change everything immediately. It sounds like you might also want to research any state or federal labor laws or health regulations that your store may be breaking, which could get you the results you need sooner.