Shop around for artists. The biggest mistake people make is designing their own tattoo before picking out an artist. That design is going to change because no two artists will draw the same object in the same way. Every artist has their own style and flair. Pick one you love based on their style, and work with them to visualize your ideas. If you want a shark tattoo, and the artist doesn't have a shark in his/her portfolio, it doesn't matter. Every artist can draw a shark. It's how they draw it that matters. Once you pick out an artist you like, do some research on what makes a good tattoo artist and see if they check off everything on the list. Aside from style, professionalism and personality are equally important factors.
Deciding to get a tattoo is a big deal, regardless of whether it's your first time under the needle or not. But for a tattoo virgin, the stakes are arguably even higher when it comes to picking a design and spot that won't be hated later. Classic wrist tattoo ideas are always a great place to start for inspiration, IMO, although what you choose to ink is entirely your decision.