I have a couple simple rules I use before getting a tattoo - I have two, and I love both of them. Never regretted them once.
1) It needs to be meaningful - The quote is a great idea if its personal to you. From a favorite novel/movie/etc. But it's something that you have to find. Don't search the internet for something, that will make it impersonal. Reread a favorite book and think about what resonates meaning in your life.
2) Once you decided on a tattoo, plan it out for at least one year. If at the end of that year you still want it, go to step 3.
3) Have a friend draw the tattoo on you, or get an airbrush tattoo of what you want where you want it. This will give you time to take it for a test drive and decide if you really want it.
4) Find a tattoo artist you trust. Done just walk into a tattoo parlor and offer them your skin canvas. Do research, look at portfolios, and have two appointments. One to specifically plan out exactly what you want before he/she ever touches you with the needle.
Good luck, and happy inking!