1. Photocopies only. Do not send anything original. I scanned boarding passes and all other evidence and organized them on a word doc.
2. I feel like sticky tabs can be easily lost and probably could be thrown away when USCIS pulls everything apart to scan all you send in. FYI USCIS throws away everything like folders, paper clips, etc. I recommend organizing everything on a word document and including a brief caption next to items
3. Photocopies only always unless explicitly asked for an original. Beneficiary’s passport photocopy is included only if it’s part of the 2 year meeting requirement
4. You still have time to search for a better paying job. I-134 affidavit of support is needed for the beneficiary to bring to the interview, not when filing I-129f
5. read form filing tips and instructions on USCIS. It has useful tips like don't use a stapler, but use paper clips instead etc -> https://www.uscis.gov/forms/filing-guidance/form-filing-tips