President-elect Donald J. Trump is not known for adherence to a disciplined and rigorous personnel selection process, but behind the scenes his advisers and allies have been preparing lists of candidates for the most important jobs in his administration.

Three days after he decisively won a second term, Mr. Trump held his first formal transition meetings on Friday to turn his attention to the choices he faces.

He is most keenly interested, aides and advisers say, in a handful of roles: attorney general, C.I.A. director, White House counsel and secretaries of Defense, State and Homeland Security. At one point during the 2024 campaign, he demanded the resignation of the F.B.I. director, Christopher A. Wray, whom he had appointed in 2017.

He has put little focus so far on who will lead other cabinet departments, though he has told aides he wants to let Robert F. Kennedy Jr. “do whatever he wants” with the health agencies, and perhaps be secretary of Health and Human Services if he can be confirmed by the Senate.

Mr. Trump is relying in part on the work done by Howard Lutnick, the billionaire chief executive of the Wall Street firm Cantor Fitzgerald, who has spent months overseeing a team that has drawn up lists and done vetting for any red flags.

But Mr. Trump, who is a mix of competing impulses, is also doing what he always does: calling around to friends and associates, asking them who they think he should pick.

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