Very brief answers to these good questions are:
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Who is a true Gursikh ?
One who has obtained Naam-Gurmantr from True-Guru and Chants Naam according to Gurmat, sings or says praises of Vaheguru through Gurbani and keeps Guru's Rehit is a true Gursikh
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What is required to be a true Gursikh?
Chant Naam according to Gurmat, sing or say praises of Vaheguru through Gurbani and keep Guru's Rehit.
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What is the best way to control Kaam,krodh,lobh,moh,ahaankar?
Chant Naam according to Gurmat, sing or say praises of Vaheguru through Gurbani and keep Guru's Rehit.
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How can a person control his mind?
Chant Naam according to Gurmat, sing or say praises of Vaheguru through Gurbani and keep Guru's Rehit.
Kulbir Singh