First things first! Make sure to select a "punchy" sounding kick in the first place. Once you have a kick you like, it's time to play around with the adsr envelope. In Fl studio you can get to the ADSR envelope by going to the INS and volume tab in the channel sampler.
Next, you want to turn down all of the knobs, except for the the decay knob.
Lasty, turn down the decay knob until the kick loses it's excess sound, but still retains the "punchy" transient. In Fl studio I recommend right clicking the decay knob, choosing set, and click 1 step.
So, that's pretty much it. Nothing to crazy, but this simple trick should allow your kicks to stand out a lot more in the mix.
