Another baby!!

I want another baby so bad! I have a 2 almost 3 year old from a complicated situation. Me and my fiancé want another baby since my daughter is not biologically his. He treats her like she is his daughter and I love him for that. We are ready for another baby. I stopped my birth control but I don't know how you actually plan a pregnancy. Last time I got pregnant I was not trying and it was a very complicated situation that doesn't need to be shared. Any way my question is what do you do when you are trying to get pregnant? Like how do you plan a pregnancy?