Sunsets, in general, are challenging because your on-camera exposure meter will lie to you and overexpose the overall scene. This is one of those classic cases where you either have to expose for the sky or expose for the foreground because you can't have both. Yes, adjustments can be made in post or you can use alternative techniques, but those are advanced processes you can learn down the road.
I'm sure many people here will advice you, as I will here, to start learning to shoot in RAW format. This will give you a lot more latitude for being able to explore editing possibilities.
If you haven't explored the technique of exposure bracketing I suggest you look up how to do it with your camera and the shooting mode you prefer (manual, aperture/shutter priority or program). At the time of capture, having the ability to capture a variety of exposures you can play with later will help you in the long run. Eventually you will learn how to control your exposure and you won't have to rely so much on a bracketed range. I hope that made sense.
For a more powerful, dynamic image, foreground elements are important. Unless it is a truly fantastic sky with lots of texture and color. Just realize that any foreground element will be underexposed to a silhouette and therefore the outer shape of the subject plays an important role in being able to read as that subject again the sunset sky. People in profile, trees, gazebos, church steeples and such are classic examples of silhouettes that present well against a sunset sky.
Don't get caught up in the awe of the sky to the point where you forget (or discount) other elements of good photography. Composition, subject, emotion and story all play together well to make a fantastic image. The great thing about digital is that you can review the image on your LCD and then make corrections accordingly.
Learning can be a frustrating task but it is what teaches us and pushes us to do better. Go out there and keep practicing.