I usually use the bottom right one. Now make sure the IC is positioned correctly. A small amount of movement will not harm the chip. When it's in the right place, solder the remaining legs to the board, taking care not to make solder bridges. As always, solder from the bottom.
Next step is to install the Photodiodes or eyes.
The motors mount on the large square and rectangular pads on the bottom of the baseboard. In order for the motors to be going the correct direction, the letters must face the top of the robot. Start by tinning the solder tabs on the motors and the pads on the board. Solder the tab to the smaller of the pads first, making sure to locate it in the center of the square. Now line up the motor so that it's parallel with the side of the board.