trying for a baby!

Elizabeth
My s/o and I had the talk the other day and we're trying for a baby! It'll be my first and I'm so nervous/excited. With that in mind I have questions. I'm tracking my fertility, but should I be taking things to help? Ie vitamins? I know it's sort of a crap shoot but I REALLY want a boy and my s/o has only ever had girls... also, how will I know? How soon will it be? 
TIA!