Kudarizaka

Hello ! i am new to skyrim and modding in general. i bought the original skyrim on steam via a steam key and now want to get into modding but i am wondering if i should buy the dlc for original skyrim (which does not show up on steam search, curse you betheshda !!) or should i buy the special edition one ? to be honest i just want to have all the glorious mods, if you know what i mean...( Í¡° ÍÊ Í¡°) I will be really thankful for your insight...