You can drive the LEDs using a transistor driven by the output (pin 3 of 555) but the LEDs get less than 3mA each (I guess each LED can take at least 20mA) using the indicated series resistor. You can put the three LEDs in series (less than 6V total drop) and revise the series resistance and drive directly with the output (pin 3 of 555)
At first sight according to a datasheet the second schematic design is also correct, but it looks on closer inspection like you need to choose between one load or another - if you think about what'll happen there a little bit. You can use the discharge pin for a second LED, if you do so with a little care. If your circuit doesn't work as planned, look for **broken link removed**, or 555 Timer traffic light schematics that use pin 7 as an LED "driver."