hair colour

wonder if anyone could help. i want to dye my hair and i bought a medium red brown shade (radiance foam colour) from superdrug. Has anyone tried that before? i am not sure if its gonna look nice or not,as i am not very fair and i just hope it wont turn out to be too much on the red side.
i have tried garnier light brown before but was looking for something different.
anyone with ideas pls?