The invitation layer of your invitation should include your names, date, venue, city/state. Traditionally the bride's name comes first. If you are a same sex couple, consider alphabetical order or a friendly game of rock, paper, scissors!
If you choose, you can add a line that the bottom indicating a reception and/or suggested dress code.
The RSVP card needs a return date, their attendance status at minimum. If you'd like to add something else, like meal options or a song request, note it below.