Ads , Click , Traffic : Adsense ?

Hello all , i'm newbie in blogger
i have a blog WP with 150-250 visit/days
i have a couple of questions
what kind of ads i had to used native/banner … ?
best place to put ads on it ?
and what wrong always i have a zero click either there is a visit ?
i working with WP theme "boombox-viral-buzz"