Your thoughts?

I want to breastfeed when my baby gets here in July, I know it’s still a ways away but I want to be determined to. With my first she didn’t really ever latch on when we would try so we just did the formula and that went great. I want to try again with this baby and see how it goes. But don’t you have to eat certain things when you’re breastfeeding? I know this is going to sound selfish but before I got pregnant I was addicted to sushi and now that I’m pregnant I cant have it. I’m already thinking about all the times I want to have it after this baby. Can you eat sushi and breastfeed? Or can you just do it every now and then? What are some things you can and can’t eat while breastfeeding? Thanks!