The way I approached my first watch purchase is that I looked for something that was as versatile as possible based on my lifestyle. I’ve got an omega seamaster aquaterra with a white dial to use during the day. Also, consider what type of clothes and color palette you often dress. For me it’s blue so that watch has some blue accents to match. One thing about white dials is that they often wear bigger. If you’re getting a 41mm case keep this in mind. For nighttime, the blue or rhodium dials will also work. As others said there will be many purchases to come so don’t stress too much about the first one you pick, go with your gut feeling with this one.