Clueless when it comes to breast feeding 😨

This is my second child but with my first I only breastfed to relieve engorgment.
Now I'm 3 weeks away from baby #2 & have read books, website, etc but still am so lost lol. 
I do plan on talking to a breastfeeding consultant but any advice from you lovely ladies? 😊
Like do I try as soon as baby's born? How often? How do I know if baby's getting anything (before milk comes in)? Etc.
Thanks!