Qui-Gon Jinn

Qui-Gon Jinn was a former Jedi Master who trained Obi-Wan Kenobi and he was the one who found "The Chosen One" Anakin Skywalker. He was killed by Darth Maul on Naboo but he was very strong in the force so he appeared as Force Ghost. He helped Obi-Wan Kenobi through all his missions and battles. Qui-Gon belived Anakin was the Chosen one and he was indeed right. During the Battle on the 2nd death star Anakin threw his master in the reactor core and saw his body burst into blue flames. The profececy was filled.

Young Jedi Life
Like all Jedi, Qui-Gon was found by a Jedi who took him to the Jedi Temple to be trained as a Jedi Padawan. After he was trained to be a padawan he was the apperentice to Count Dooku before taking on his own Padawan. Obi-Wan Kenobi.