breastfeeding

I'm really scared that I won't be able to breastfeed. I'm a first time mom and don't really know what to expect. I've been seeing a lot of women talk about a breast pump? I also hear a lot of women start to leak milk before the baby is even born. I'm about to be 8 months and have noticed that I have sort of a white, dry discharge on my nipples which isn't visible unless I stretch my nipple just a little (look deep into my nipples) I also just seen a post of a women having a freezer full of containers that were filled up with milk. If I'm able to breastfeed do I still need to pump? Is it necessary, if so, why? Any feedback will be greatly appreciated. Please no judgment, I'm a first time mom.