Is it babytime yet?!

Seeking advice and opinions. 
For those of you who have or haven't had a baby... What is your advice for a married couple when it comes to finally starting a family. Things you wish you knew? I am ready for a baby but I'm so scared which is normal. My husband and I have had pregnancy scares when we weren't TTC and still go so excited secretly hoping I was pregnant. 
When is the perfect time to get pregnant in a marriage.  I am 21 my husband is 23