WASHINGTON — The House intends to vote this week to send its articles of impeachment against President Trump to the Senate, prompting only the third impeachment trial of a president in American history.

The vote will put to rest nearly a month of uncertainty over when a trial might begin and quickly turn over to the Senate a historic debate over whether Mr. Trump committed what the Constitution describes as “high crimes and misdemeanors.”

The Republican-led Senate is all but certain to vote eventually to acquit Mr. Trump. But the path forward remains murky, with few historical precedents and scant constitutional guidance to light the way. While decades-old congressional rules will be dusted off in the coming days, other, potentially grave decisions that could color the outcome of the trial will be settled on the fly.

Here is how we expect things to play out on Capitol Hill in the coming days and weeks.

First up: naming managers and a vote to press charges.

The House passed two articles of impeachment nearly along party lines on Dec. 18, after a monthslong Democratic inquiry. The articles charged Mr. Trump with abuse of power and obstruction of Congress in connection with a scheme to enlist a foreign power for help in the 2020 election. They accused him of using his presidency to pressure Ukraine to investigate his Democratic political rivals, by withholding a White House meeting and nearly $400 million in military aid as leverage.