https://fas.org/sgp/crs/misc/R45769.pdf
The House impeachment process generally proceeds in three phases: (1) initiation of the impeachment process; (2) Judiciary Committee investigation, hearings, and markup of articles of impeachment; and (3) full House consideration of the articles of impeachment.
Regardless of what might instigate an inquiry into whether impeachment is warranted, there are normally three formal stages of congressional action. First, an impeachment inquiry is authorized, and this is most often accomplished through the adoption of a simple resolution (H.Res.___) directing the Judiciary Committee to investigate an official. Second, the committee conducts its investigation, prepares articles of impeachment, and reports them to the House. Third, the full House considers the articles of impeachment and, if they are adopted, appoints managers from the committee to present the articles in the Senate. As discussed in detail below, the House relies upon many of its usual procedures to consider the resolution explicitly initiating an investigation, conduct the investigation, and consider the articles of impeachment.5