8253 / 82C54 timer, clock input
Those clock input pins are just that, logic inputs that need to be driven with a logic clock signal. There is no oscillator circuit provided on the IC. You will need make your own oscillator, so take your crystal resonator and wrap it round an inverter with suitable Cs to ground and a big feedback resistor for DC bias. Alternatively you could buy a ready-packaged clock oscillator, they are not ruinously expensive. I see from the data sheet that at 5v supply, the clock logic thresholds are 2v and 0.8v. This means your clock signal can be TTL or CMOS levels, either will work. If you happen to have a clock signal kicking around somewhere else in your system, then use that.