What advice can you provide to a single father that is raising a daughter by himself?

Just a little background: I’m a 30 year old single male and recently my best friend and his wife both passed away due to a collision with a drunk driver. I was the Godfather to their 3 month old daughter and I have been given custody of her. I have no idea how to raise a child and I’m going to be doing this alone and honestly, I am terrified. Please offer me any advice that can help me.

Edit: I just want to say just how thankful I am for everyone who has given me advice. I’m honestly in tears.