Hello!
1) if baby manages to latch - it's up to you whether to pump or not. Baby feeds on demand during first few months so might latch a lot if you plan to do full latch only. To pump or not - what's your goal ultimately? Do you plan to introduce the bottle so that someone else can also help feed the baby? Are you going back to work so you want to slowly build a stash of bm? You might want to think about these :)
2) if baby hasn't started latching well yet and milk supply is low - continue to latch. Remember to be kind to yourself and baby, both of you are learning TOGETHER. I continued to latch and pump to stimulate and increase supply, while also supplementing with formula when necessary. When I had enough, I stopped supplementing. If you feed fm to supplement and want to continue to bm, yes do still try to latch/pump/both.
3) if milk output is low, and be kind to yourself, it will be low at least at the beginning, it's up to you to freeze or chill. Since you may not have much, you may want to just chill it in fridge since you'll need to feed the baby soon. I only started freezing after I had surplus.
Hope these help! If you decide to stop bf for whatever reason eventually, remember it's your body your baby your choice. Nobody can guilt trip you into continuing / stopping. Take care and safe delivery!!