Second you need to find some Flash Art Tattoo, and what is a flash art you may ask?
From wikipedia - ''A tattoo flash is a design printed or drawn on paper or cardboard, and may be regarded as a species of industrial design. It is typically displayed on the walls of tattoo parlors and in binders to give walk-in customers ideas for tattoos. Tattoo flash may or may not come with an outline, also known as a stencil. This outline is typically printed on a separate sheet. This is convenient for the tattoo artist, who would otherwise have to draw the line work for themselves. ''
All over the web you will find many FREE galleries containing Flash Art Tattoo, but those kind of design are not unique at all, the vast majority of them are really not worthy a penny, due to the lack of resolution or the low quality of the line work. And there will be always the chance of thousands of people having the same design as you. Most of those free images are done by people without the minimum understanding about what makes a Tattoo Flash Art good enough for skin application.
On the other hand there are many paid sites too, but don't make mistakes here, some of this sites are complete scams, charging you for a collection of 1.999 drawings that are the same as those free content all over the internet. The good ones are those that allowed you to search exactly what you are looking for, so if you want a specific angel design for example you buy only that one, and not a entire collection of crap images with only one or maybe two angels in it. This will save time and money, and that is always a good thing.
The best Flash Art Tattoo are made by professionals in the business and ALWAYS come with stencils ready for download. After all that done, the only thing left is finding a trusted Tattoo Artist of your choice and get it done.