new Tacoma 2014 sounds

Want to add to radio but use factory head unit and add amp and woofer I don't have nav. but has every thing else I want and after paying payment have a low budget to work with would. like to add to unit as I go and would like some good sound with some bump to it don't want to wast money being components and find at latter thay won't work with one that's all ready in the truck hate paying for thing that I don't won't are can't use any help will be great fully appreciated