The fashion for eyebrows changes all the time. Whilst it used to be fashionable to have very skinny, well-plucked eyebrows, it is now a much more popular look to have thick yet well-shaped eyebrows.
You might want to start off by looking through beauty magazines to get an idea of what is in fashion. This will help you to decide what kind of look you would like.
Next, work out what will work with your face shape. If your face is very narrow, you will need to be careful not to have eyebrows that are too thick or they could take too much prominence within your face.
It may well be worth talking to a beautician and having your eyebrows shaped professionally. They will be able to recommend shapes to suit your face and they will be much more reliable as a beauty professional. You can get many different services such as threading, plucking and waxing.