There is no resistors in the kit. Can't believe it.. How can I develop without the resistor?

Sorry we donot have the list for this sensor kit.
You could take a look at this Arduino kit.
https://www.dfrobot.com/pro...

We have 16 project post on the Github:
https://github.com/DFRobot/...

How do I connect a the LCD Display on the sensor shield, only having female to female cables? The SCL and SDA pins on the sensor shield are female-pins as well...

Each module has been designed with necessary resistors, you can connect the module to Arduino and use it directly, we have made wiki for each module, you can read and know how to use them.