New To QFF - A Few Questions Please

Hi guys!

New to the world of QFF! I'd like to book flights for our family to Japan (Haneda) between Oct-Dec. This is the first time we will travel as a family, so I have a few questions:

1) Currently have 120,000 points and want to book business for at least one way for my wife. I will fly cattle class - how do I do this when making a group booking via Qantas Website?

2) My daughter is under 2 years old - will she be able to sit with my wife in business without additional fees?

3) When I looked last month, there were a bunch of classic rewards business flights to Haneda for 50-60k points + $xxx, best value I can see how is 75k points :( - does Qantas release more classic rewards flights throughout the year?

4) Thought about using points to fly to Singapore or Hong Kong for a few days then paying out of pocket from there to Japan. Ideally though, would like to fly with partner airline to either of these countries. How do I use my QFF points with partner airlines?

Thank you all