Answer by taking a quote from the following article:

Faber was born on a farm near Cascade, Iowa, on September 6, 1888. He was of Luxembourgish ancestry. While Faber was a child, his father managed a tavern and later ran the Hotel Faber in Cascade. His father became one of the wealthiest citizens in Cascade.

Faber started well in the minor leagues. He pitched 15 games for Dubuque in 1909 and returned to the team in 1910, registering an 18-19 win-loss record and a 2.37 earned run average (ERA) in 44 games. He threw a perfect game for the Dubs against the Davenport Prodigals in September of that season.  He also spent time with minor league clubs in Pueblo and Des Moines. He broke into the major leagues in 1914, starting 19 games and relieving in another 21; he posted a 2.68 ERA while winning 10 games and saving a league-leading four games. Through the 1910s, he would vary between starting and relieving for a team which enjoyed a wealth of pitching talent. In his 1915 season, he won 24 games to tie for second in the American League behind Walter Johnson, and he led the league with 50 appearances. In one game that season, he pitched a three-hitter with only 67 pitches.  In 1917 he had a record of 16-13, and at one point started - and won - three games in two days. He saved his best work for the World Series against the New York Giants. After winning Game 2 in Chicago but losing Game 4 on the road, he came into Game 5 (at home) in relief and picked up the win as the Sox came back from a 5-2 deficit in the seventh inning to win 8-5. Faber came back two days later to go the distance in the clinching Game 6 at the Polo Grounds, picking up his third win of the Series by a 4-2 score. As a consequence, he holds the all-time American League record for pitching decisions in a single World Series with four, a record which stands to this day.  His pitching was better than his baserunning--in one game he tried to steal third base when it was already occupied. Faber said that he saw the lead runner rounding third base on the previous play and he thought that the runner had scored a run. When the pitcher slowly entered his windup, Faber ran toward third base. However, in one game against Boston, he stole home, a rare feat for a pitcher.  After spending most of 1918 in the United States Navy due to World War I, he returned in 1919 only to develop arm trouble. He had lost a significant amount of weight during the war. He finished the year with a 3.83 ERA - the only time in his first nine seasons he posted a mark over 3.00. Those problems, along with a case of the flu possibly related to the Spanish Flu pandemic, prevented him from playing in the scandal-torn World Series against the Cincinnati Reds. Years later, catcher Ray Schalk said that had Faber been available, there probably would never have been a fix (presumably because Faber would have gotten some of the starts that went to Eddie Cicotte and/or Lefty Williams).

When did he start in thge minor leagues?
1909