Prepare accurate identity, family and immigration-history records, together with a clear account of the proposed funding. The official sequence provides USCIS instructions to complete Form I-140G and supporting documents through the portal after the initial application and payment. Use those instructions for the actual document requirements rather than relying on a supposed universal private checklist.
Prepare the records without inventing a filing package
Make a chronology of major identity or family changes and retain the underlying documents. For funding, distinguish assets that can be used now from proceeds dependent on a future sale or distribution, and preserve records explaining ownership and transfers. Reconcile different spellings or inconsistent dates before uploading.
The authorities may ask for additional information, so keep a record of what was submitted and respond through the instructed channel; preparation does not replace the official request. Keep a single register of what has been uploaded, on what date and through which channel, and store a copy of every file exactly as submitted. If additional information is requested later, the answer has to be consistent with what was already provided, and that is only possible when the earlier submission can be re-read rather than recalled.
Where documents exist in another language, arrange translations meeting the instructions actually given rather than assuming a general standard. Agree who in the household is authorised to respond, so two people do not answer the same request differently.