Some people are happy with a single tattoo, but often it become a sort of addiction and the desire for more can turn it quickly into a mess if you are not careful . If you are young and still have a career in front of you, be well aware that visible tats can hinder your advancement potential. Many places have strict policies regarding visible tats. So keep it in mind, while we all like to show off the artwork, the best places to begin are the back or other unexposed area until you feel sure of your life's direction. I did not start mine until my 50's! Now I don't give a care about what others may think, but I had a long career in banking and I would have been fired if I had done them then. Even though my arm is covered from wrist to shoulder, I can completely cover them with a long sleeve if need be.
Keep in mind a theme or style. All of mine are done in a Polynesian style which keeps the flow balanced and appearing to belong together. Some styles are Tribal, 3D realism, Polynesian, Maori, Traditional Sailor, Celtic and so on. Do lots of searches and look at styles, see what appeals to you.
Have the artist design the tat in advance. I took photo's of what I had in mind, but the artists all designed them for me, taking the ideas and giving them life with their experience. A good artist takes into consideration your skin type and the placement. They can often give advice as to how to incorporate what you may already have with what you want.
Tats don't have to have special meanings, they can simply be appealing designs. Be very careful of trendy tats, they may end up looking pretty dated in time. I highly recommend not getting tats about death or morbid or violent subjects. It may be cool in your head right now, but 30 years from now it may be ludicrous and embarrassing.
Lastly, try your hardest not to get someone's name on your body no matter how sure you are of the bond. Tating a name does not make it permanent anywhere but on your skin. Remember that life goes on, it changes over time and a tat should be a part of your life and sense of self. I recommend going for classic timeless appeal in your designs.