What to send to your fiance(e) once the I-129F is approved (Receive NOA2):

1. A copy of the entire I-129f package (that you made when you sent the petition in) and a copy of information that you sent back due to an RFE (if you received one).
2. Send all originals of the documentary proof that you submitted for the I-129F to your fiance(e) for their interview at the embassy.
3. Send an original letter affirming your desire to marry your fiance(e) and your continued support of the K-1 Visa. Sign and date the form. This will be similar to the letter you provided with the I-129F, but dated much closer to the interview (it will have most likely been several months since you submitted your I-129F).
4. I-134 Affidavit of Support form. Ensure it is notarized (by a US Notary Public), with all required supporting evidence. Begin collecting the required information ahead of time, as it can often take several weeks to collect it all.
5. You will likely need at a minimum (for the above form) two to three of your most recent pay stubs and a signed letter from your employer listing you job title, start date, your salary, and the status (full-time) of your position. Begin collecting these ASAP after your NOA2 arrives. You will also probably want to include other evidence such as your banking information and other assets as required by the I-134. Specifically you will need at least 2 of the 4 options mentioned in Section II-Supporting Evidence of the I-134. See this FAQ for more tips and ueful information on the Affidavit of Support Form.
6. A copy of the NOA2 that you received in the mail.
7. Proof of your ongoing relationship. This needs to be taken to the interview! Include photos, travel documents, emails, etc from between the time you filed and present (NOA1 date-now).

Examples: Copies of phone bills, cell phone bills, emails (you can edit personal info with a marker), letters (edit personal info also), stamps on the letters (to document the date they were sent), and other written documentary proof. Provide a reasonable amount; two to four of each type. Pick a range of dates up to and including the present. You can also include a copy of engagement ring receipt (this is something that is a big optional - do not worry if you do not have a ring yet!)