Congrats!
This link may be helpful in your ettiquette questions on the invitations.
Outer Envelope
Mr. and Mrs. Robert Martin
3790 Happy Lane
Davistown, Iowa 95616
Inner Envelope
Mr. and Mrs. Martin
*(Joshua, Aaron, and Cole if children are invited)
*This is the best method to inform your guest that their children are invited.
Children are listed by age, older to younger.
Children over the age of 18 should be sent their own invitation.
Children are not mentioned on outer envelope.
A couple who live together, but have different last names:
Outer Envelope
Mr. James Martin
Ms. Sheryl Stone
Inner Envelope
Mr. Martin and Ms. Stone
This example shows the unmarried man first and the unmarried lady 2nd. I always thought the unmarried lady came first for all invitations. QA
How exciting for you and your family!