you want a big bench do these things:
1) learn correct form for your body. I seriously think 95% of the gym goers I see in commercial gyms and 99.9% of the "trainers" don't know how to bench press worth a shit. All they are doing is repeating bullshit they get from a stupid bodybuilding magazine thats on the market to sell supplements, not tell you how to train correctly. There is a link in this forum on "bench press setup". Start there.
2) build strong triceps. Don't fart around with dumbell kickbacks. Pick up a heavy barbell and do JM presses, close grip presses, dips. Make the triceps work.
3) build a big upper back. You have to have a platform to launch the weight off of. Look at the biggest RAW benchers at powerlifting meets. They all have HUGE backs. deadlift and ROW, ROW, ROW
**** While you are building that big back and triceps, learn to use your lats and triceps and to drive with your legs when you bench***
4) Dont' be afraid of the heavy weights. Get under the bar, squeeze the shit out of it, and push like the person spotting you won't pull it off. Your brain is your weak link. Get your brain to think you are strong by overcoming fear of the weight and you will become stronger.
5) work your training with a day focusing on speed and a day focusing on maximum wieghts. A fast bench is a strong bench, but you have to be balanced. If you just work on speed you won't get enough heavy weight lifted to get stronger. If you just focus on maximum efforts, you will break down and eventually get weaker
6) Gain weight. If you get bigger, your bench will get bigger because you will shorten the range of motion.