The DB press is more of an isolation exercise, it will focus more on the chest itself. Great for defining the pecs.
The BB press is a compound exercise and will incorporate more muscle groups. Good for adding mass.
There is some information of a routine a few posts above me.
However, I will state that you should always warm up with flys rather than a press. This will stretch out your pec and warm it up, while the press leaves you more susceptible to a muscle tear.
If you are looking for something new, invite some change into your routine.
I do my flys and presses on an exercise or stability ball.
I start with my flys on the stability ball, and in between sets I do push-ups.
Then I do db presses on the stability ball, 3 sets at a flat angle, then I move my body weight slightly forwards to an incline and do 3 sets of presses that way.
I do another variation of a press, the floor press, I do dips in between sets.
Then to end, I stretch my pecs back out on cable flys.
Chest = wrecked.
At this point your chest will be wrecked, be sure to get some nutrition ASAP. I take a quick shower at the gym, drink a protein shake and a protein bar.
Smoke a bowl when I get home
and make dinner.
BOOM