Waqar returned to the top job in Pakistan cricket in May, having previously resigned for personal reasons in 2011, ending a 16-month stint in charge.
The paceman took 373 wickets in 87 Test matches for Pakistan and also has a wealth of coaching experience.
Pakistan face Sri Lanka, Australia and New Zealand later this year, while the 2015 ICC World Cup will also be on the coach's mind.
And he thinks they can improve with a positive brand of exciting cricket.
"I have come with a positive frame of mind, there's no doubt about it," he said.
"I have come with a better plan, I think the team could get better with changes and we can match any team in international cricket.
"I was here two years ago and you people saw there was improvement in the team.
"I have come with a lot of passion and the mindset will be the same, we will play positive cricket and will play to win, there's no defence involved in it.
"Hopefully the boys will understand what I am trying to say and I hope this passion will be there in them as well.
"I believe the youngsters are very talented, they will understand the spirit."
Pakistan sit third in the Test and Twenty20 international rankings, but are sixth in the one-day international standings.