Breastfeeding prep, what will I need?

So I plan on breastfeeding once my little munchkin gets here, I type in maternity bra and so many designs styles came up, what’s the best one? The most comfortable? Where do I go just shop online or in like Walmart or target? I know there is leaking involved do I need a special bra for this? I heard it gets painful do I apply anything? I would think no since it’s chemicals and the baby is drinking from it, My mom and Mil, friends basically everyone I know didn’t breastfeed so they are zero help lol