Like lion said, don't work out your forearms after you leave the gym, and definitely don't work any muscle out every day (except abs). At a very minimum a muscle needs 48 hours of rest after strength training or it never has a chance to grow, and many people find their gains speed up if they start resting longer than 48 hours (mine did).
Benches should help with triceps, but at a wide grip they aren't meant specifically to target them. Because of that, and because the tricep has three heads which can all be hit separately, i also do weighted dips and lying tricep extensions for tri's. Make sure to steadily increase weight if you aren't already. You could spend the rest of your life benching 135 for 8 reps and you would never get stronger if you didn't keep adding weight.
Preacher curls have a lot of synergist muscles, but their main target is a small, less noticable muscle, so I wouldn't expect to get hulking forearms with them alone. I personally add wrist curls, reverse wrist curls, and reverse curls to the forearm mix. Deadlifts also work your forearms, and are a great mass builder to boot.
If you don't know what some of these exercises are, you can look them up here, and find some other good stuff on this site as well.
http://www.exrx.net/Workouts/Workout2PP.html
Also, since you're new to bodybuilding, you should spend a lot of time doing research. In the beginning, your most effective work is done outside of the gym. A newbie who spends 100 hours researching and 100 hours in the gym will come out looking much, much better than a newbie who just spends 200 hours in the gym. There's ALWAYS more to learn, but if you don't spend a lot of time learning at first you'll end up kicking yourself down the road for all the time you wasted doing the wrong stuff. Read the stickys in the weight training forum and diet forum here if you haven't already.
A lot of good intro information is on this site, particularly under "Anatomy"
http://www.abcbodybuilding.com/