Resolve the material chronology and eligibility questions before treating a start date as firm. A proposed date may guide planning, but it cannot supply missing qualifying employment or work permission. The actual procedure and outstanding evidence determine what can responsibly be scheduled.
Give the employer a clear dependency list
Identify the disputed or undocumented periods and who can provide records. Explain any remaining corporate or US-role questions at the same time. Avoid letting a calendar target pressure the company into backdating a promotion or misdescribing duties.
Allow several weeks to gather corporate and payroll evidence and draft the petition, then USCIS processing time or the premium processing window, then admission at the border or a consular appointment for non-Canadian family members. L-1A eligibility also rests on a continuous qualifying foreign year within the previous three and a qualifying parent, branch, subsidiary, or affiliate relationship, with the foreign organization doing business; for a new-office L-1A petition, that foreign year itself must have been managerial or executive. Work backwards from the season the U.S. operation is meant to serve, allow for a request for further evidence, and put the twelve-month extension review in the calendar on the day the first petition is filed rather than eleven months later.