You have already received some really great advice, go with what works. Arnold once said that it doesn't matter what exercise that you do as long as you do ones that work for you. Now, since flat bench barbell is such a basic movement I wouldn't throw it out the door just yet. Use a spotter and go with heavy weights and low reps. If you still get nothing after a few weeks or so, check your diet and your routine. Check to see if you are getting enough carbs and protein and make sure you aren't overtraining.