If you know others that have lettering on their body and it is something you admire, you may want to ask them what type of lettering it is and you can investigate it further.  You may even see someone on the street that is using lettering that you like and if you are outgoing enough, you may want to approach them and see where they had their work done and what style they used.

You may also want to visit a tattoo parlor or two and find out which type they have available.  You should view as many as possible to have the largest variety.  You will then truly find something you really like, rather than settling for something you may not like as well later.

An online gallery is another great place to find tattoo lettering examples.  You may find that this provides you with the biggest selection and you should be able to find a few different types that you like and then you can narrow it down from there. 

Chinese writing is a very popular style and you may want to view this type of lettering.  You will want to know what the letters mean so you do not get something that does not make sense.  If you do not know what Chinese lettering means, you can find out anywhere on the internet with a simple search.

Old English is another very popular style of writing.  Many artists have subtle differences in how they do this type of lettering so you will want to see how the artist of your choice draws this style of writing so the two of you are on the same page.

Tattoo lettering is a great way to represent something in ink.  You need to know about the style you want so you do not have a tattoo that you regret. 

Summary: tattoo lettering comes in many different varieties.  You will want to do some investigative work about each style to make an informed decision.  You may want to find out how the artist of your choice performs the lettering you are interested in before you get it permanently.  You want to do several things before you get your work done, so you know you are making a great choice in tattoo.