Have you ever done this before? If not, I'd highly recommend to have a skilled professional do it, at least the first time.

Secondly, dyeing your hair for a man ideally should be a subtle secret. That is, you want it to look natural (you can move to fuller/more daring color with time). Otherwise, when overdone, it looks needy and attention seeking (unless you're in punk band or something like that).

Lastly, use quality products. There are horror stories about men using cheapest products to dye/bleach hair and end up with laughable (literally) results.