Haakaa?

I’ve seen so many women on here suggest and recommend the Haakaa so I bought one. Only problem is, I’m not really sure how to use it. I understand most women use it to collect milk that leaks while breastfeeding but I’ve read where it kinda pulls milk out too. Like a pump just not as forceful. Baby eats on both sides right now so how would I use this? Would it make my body produce more if I attach it on one side then let him feed off that same side after he’s done with one breast? Do I attach it after? So many questions lol