Pink hair can be like candy floss, meringues, candy, icecream or bright like a highlighter pen!
Unless you're blessed with natually light hair, you'll need to lift/lighten your hair first, and then use a temporary colour. Pink will fade, and usually changes shade each and every wash. If it's a bright/bold pink you may find it transfers to your towels and pillowcases. If it rains you may get a pink face! Pastel shades are less transferrable, but even more temporary.
To maintain your pink hair you can add pink dye to a conditioner to keep it topped up every time you wash it, or go brighter/darker and purposefully fade it out.