Welcome, you have something to share with your daughter!

Typical flight speed in training is about 35MPH to 70MPH, sorta depends on the ship.

There are airports that support training and flying sailplanes, but almost any is fair game if weather means you have to land somewhere else.

To find places to fly, go to SSA.org, they have a "where to fly" on a map with contact info. Sorta depends on.....
-where in NJ you are
-weekend only OK, or do you also want during the week (some sites are weekend only, usually clubs)
-find some places, go there, interact, ask questions, see if the group is something you can feel good about

There are places in eastern PA, NJ and southern NY to fly. I fly with Valley Soaring in NY.