Waqar, who officially began his second stint as head coach today, told reporters in Lahore that he had learnt a lot from his first stint.
"I have said it before I have learnt from mistakes made and I say when you have a group of people together all the time for long periods some disagreements do occur. I guess it is the job of the head coach to man manage these things and that is what I will try to do my best now," he said.
"It is now a thing of the past and we have to move on."
The former fast bowler, who served as head coach in 2010 and 2011 before resigning on personal and health grounds, also made it clear he had gone for the post a second time because he believed that Pakistan was capable of beating anyone.
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"We are capable of defeating any team. And I believe that with the right mix of players and with the right approach we can do well in the World Cup in 2015," he said.
"We are getting the right mix of cricket and we can prepare for the tournament accordingly because conditions in Australia and New Zealand are difficult and we have to plan ahead," he said.
The former captain however made it clear he had no plans to build a new team for the World Cup.
"That would not be a wise move because like I said the World Cup is a big tournament and they are lot of expectations attached to it. So we will try to find the right mix of players. What I am happy and excited about is that we have some exciting players coming up and I am looking forward to working with them," he said.