What is the best blonde hair dye to use?

I have dark blonder hair that is golden when the sun shines on it but recently, as I've been getting older in my teens it has started going very dark and almost to a brown sort of shade. I have never dyed my hair before and the hairdressers always overprice. I wanted to use a box colour that is not shockingly blonde, but will lighten my hair up and make it lighter. Can anyone recommend any good ones that are also quite easy to use please? Much thanks. x