I spent alot of time in the library and art galleries looking for ideas and pictures, plus the internet is full of places that have pictures. But two of my tattoo's came from ideas I got in the most unlikely places. 1 from a greeting card found in a truck stop and 1 from a ad in some junk mail, but the designs just happened to be exactly what I was looking for. You just never know where you will find the perfect design, so keep an open mind and always be on the lookout for designs.
There are several top notch tattoo studios that have thier own website, just doo a google search for "tattoo". The high quality studios have sections giving advice on what to ask an artist and what to look for as far as cleanliness and sterilization eqipment. Also provide advice on what to do prior to getting a tattoo and after, and after care is extremely important if you want your tattoo to stay looking good for a long time.
It takes research and some time to find a quality artist and the design you want, but in the end, the time spent looking is worth it. If you see a tattoo on someone that looks great, ask them about it and who did it. Most people are proud of thier artwork and are glad to discuss it. Also if you see a tattoo that looks terrible, politely ask the person who the artist was who did it (that way you will know who to stay away from) I have done that myself, pretended to be interested in a tattoo to find out the artist, and made sure to remember who it was so I could avoid that artist in the future.
Good luck and have fun.