for the cotnrols you may look at this youtube tutorial:https://www.youtube.com/watch?v=yY0HkfN2v64
Or in "simpler" terms:
- Start speed dreams
- Click "Configure Player"
- Select the player you want to configure from the list of available players ("Player" by default)
- Click the "controls icon" (the one with the arrows pointing in the 4 direction) below the players list
- Then click the control you want to configure and then press the key you want to assign to it
- Click Save
- Click Apply
For point 2 and 3... looks like you only have the selected track and car available.
Maybe you have installed only the base package? There are more packages with additional cars/tracks!