Can anyone relate?

Let me start off by saying I'm 27(on Monday) I'm happily married for 2yrs and together for 10yrs, my entire life i wanted to become a mom. Recently my husband told me we can start a family whenever I'm ready. (I've been trying to convince him for over a year) now that i finally have the green light I'm nervous! I keep thinking what if....what if we can't afford this,what if i won't be a good mother,what if i can't breastfeed. I have so many questions and i can't talk to my family about my concerns because i want them to be surprised if we do start ttc. Does anyone have any words of wisdom? Idk what to do.