1. Soreness is not an accurate indicator of progress. Being able to do more weight or reps is.
2. Although chest exercises aren't "difficult" to learn compared to say, the squat or snatch, it's still possible to use improper form on them. How far apart your hands are, the position of your elbows and how you position your body on the bench can all make a big difference.
Stronglifts has a pretty good guide on the bench press I'd suggest your read.
Starting Strength is an excellent resource for learning just about any barbell exercise.
3. You must use full range of motion to ensure all the proper muscles are being used. On the bench press, this means the bar goes from touching your chest to lockout. If you don't go all the way down, you're primarily using your triceps and delts and it's quite possible your chest isn't getting much of a workout.
4. If you are relatively new to weight lifting, you really don't need that many chest exercises. Doing heavy (ie, 3 sets of 5) bench press and dips 1-2 times per week would be plenty. Just make sure to balance it out with an equal amount of pulling exercises (pull-ups, rows) and overhead exercises (OH press, push press) so you don't develop rotator cuff imbalances and ultimately, injuries.
5. In my experience, some muscles and body parts are more prone to getting sore than others. For example, my traps get sore pretty easily from the overhead press, but my deltoids almost never get sore, no matter what I do with them. Despite that, both my deltoids and my traps got stronger and bigger. Once again, it just goes to show that soreness is not an accurate indicator of much of anything.
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