Taric can actually be built a couple different ways. You can play around with the builds and see what play style works best for you. He isnt really a bot laner, havent had much luck with that.
I really enjoy playing him as, ap. Go mercs, nashors, malady, aegis, other sustain items or as items depending on how much damage enemy team is doing. This build is fun because your Q comes up so frequently and you get tons of mana back.
Another way to build is burst ap. Build mercs, then ap items such as lich bane and rylais for sustain, even roa can be useful for him. Ive seen this played fairly well but havent personally tried this build.
The most popular taric build is tank. Items like mercs, odyns, aegis, randuins, frozen heart. Again i have not tried this build because tanking is kind of boring to me. But the important thing with each of these builds is to try to max out on cdr so you can spam his abilities.
Gl and hf :)