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For this hairstyle particularly you need very clean smooth hair. You should preferably wash you're hair the night before and let it air dry.
Heat up the straightener while brushing you're hair and applying a shine serum, (optional on the serum.)
Run a damp hair brush through you're hair and apply heat protectant to shield you're hair from heat.
Once you've got it all heated up straighten 1" sections of you're hair at a time thoroughly, (unless you're hair is really straight and shiny already.)
Pull all you're hair back into a pony tail, twist the band around a couple time and on the last time you're going too twist it pull it out half-way and leave the pony half out to create a low bun.