It's difficult to identify the important content and how students might approach an activity without actually doing the mathematics yourself. These are, for the most part, short problems and activities. Allow yourself time to work through the mathematics, even briefly, before going on to answering the other questions.
To make a shape on a geoboard, think about using a rubber band around pegs. You may want to get a real geoboard and work with your colleagues to experiment and gather some data. Remember, you don't want to just think about particular cases such as only examining squares or only examining shapes where the sides are parallel to the sides of the geoboard.