Hello,
Yes the thing you are missing between the LPT port and the stepper driver is called a breakout board. It buffers the LPT control lines and provides enough current to drive the PUL, DIR and EN optocoupler LEDs inside the stepper driver.
Have a look on eBay there are plenty of low cost ones available.
If the tb6600 specifies 5 volts then that is what you should be providing. A small power pack is only a few dollars or if you have an old cell phone charger that is probably 5V too.
David