Congratulations!!!

My husband and I are in the process of getting our application ready to send in. I will be applying outland at the Buffalo office. I was hoping you could answer a couple questions.
After turning in the application, does the paperwork from the immigration office get mailed to the immigrant or to the sponsor? I'm asking because I will be traveling while the application is being processed. I wrote my parents' address on the application and I will be in constant contact with them.
Also how much evidence did you send as proof of your relationship? My husband and I have been together for 4.5 years, (we lived together for 3 years in Korea and have been apart for 1.5 - I'm in California and he's in Nova Scotia). We have three reference letters - one from a priest, one from the parents of our Godson, and one from a very close friend. We also have pictures of us traveling together in Japan, Vietnam, and Thailand. Should we also send in our itineraries from when we visited each other in California/Nova Scotia?
Thank you in advance for any and all help you can offer. And CONGRATULATIONS again!!! And thank you for posting your success story, it gives us hope!!