Help me with credit card suggestions

Hello,

have a friend whose family owns a restaurant, and they spend about $5,000 a week at Restaurant Depot on supplies. They offered me a deal where I can do the shopping for them and deliver it to their restaurant, and I’d be able to use my own personal credit card.

I thought this could be a really good way to earn a lot of points. Which credit card should I get that would give me the most points back on warehouse purchases? I’m open to all recommendations.

Thank you!