Hello, I am a teacher and had several ESL trainings in MA on this topic. I also spoke with my instructors because I have a daughter (at the time not born yet) and I wanted her bilingual as well. Her father is Dominican and I understand some spanish but am not fluent and really not even conversational.
1) the best way for children to learn and master the sounds so that they can speak like a native is to hear BOTH languages from the beginning.
2) It is less confusing if one parent speaks one language and the other another. I know that when we were in Germany the kids downstairs (American) who went to German preschool were fluent and could switch easily from one to the other- they even knew enough at two and four to answer Oma in German even if she asked them something in English and us in English even though we asked them something in German.
3) The instructor said if you can be patient, your child may actually speak a little later because they are processing two languages but they will have a stronger foundation and understanding to build on of both languages
4) As for Daddy, maybe he will pick up German as a plus too. I have Hector translate when I don't understand. also you can speak to Daddy in German and then English, but keep you language to your daughter as pure as possible. (I know it is extremely difficult- I keep fight with Hector just to speak spanish and that I will ask if I can't pick up on what he is saying.)
5) We also added sign language to help her get her needs met. Later she used them to emphasize when her request were met with a no- she'd say it in one language then the other then sign- maybe this time I won't get a no.
6) We also read books to her, listen to music, talk, count, colors... when counting her toes we did it both ways. When playing with the rings we did both sets of colors. (we were also lucky enough to send her to a spanish speaking family day care- so she was emersed all day)
7) it is tough but you and your husband need to find a happy medium. You ned to make sure everyone is comfortable in you home. And any bit you do will help her and be a great foundation to build on later.
Good luck. It is not as easy when both parents don't speak the language. I know his family is welcoming and try to include me but I do miss out on some of the conversation. I get most of the gist and will ask questions now and then. I also am getting better at participating- I have a good vocabulary but don't know the correct article or conjugation and other syntax rules.
I know there are much better experts out there. Hopefully some other successful moms will weigh in. You need to hear what the experts say and then make it work for you. All my best. Don't worry just enjoy this miracle and the rest will fall in place.