How can you be an effective Manager having motivated staff & will work hard for you with respect, not because their force to do it and your the boss?

its simple just show them thier benefits and convince them that if they will do the job safely they have the benefits because on them many family members are depended and if they had an accident dur to rhier negligence they and thier family will suffer

as simple as it is, to start act like a leader.

a leader is the one that shares his employee with all plans and procedures and take their opinion into consideration. Also, he is the one who is not only giving direction, but work with his team and help them do their tasks. the one who really thinks himslef as same level with his team and make them feels welcome to open any concern they have. the one who build trust amongst the team member.

as i said earlier, start thinking as a leader, not a manager