Number 1: Pause EVERYTHING. Every rep you do. Warmups, maxes, speed work, rep work. That will bring you up to speed relatively quickly. Remember, competition bench presses are always paused. You can keep pushing up your touch and go and have nothing happen to your paused bench. It's pausing that builds the pause. And if you end up trying a touch and go later on, the pausing will build the touch and go, while the inverse is not true
Number 2: Like Sean said, Pin Presses. Get in the rack, set the pins at chest level or an inch or two above, bring the bar down to rest on the pins (you stay tight, the bar rests) for a long count (2-4 seconds) and then press it to lockout. Be warned, pin presses are harder than bench presses, so be conservative with the weight. Focus on letting the bar settle and then exploding off the pins all the way to lockout.
Number 3: Pause Presses with the bar 1" off the chest. Hold the bar just a smidge off of your chest and pause it there for 2-4 seconds. You'll learn to stay tight and carry the weight in the proper place, which will make you better off the chest.
Do those three, and soon enough, the first time you ever bench 325 will be with a pause.