since you are new to cdrama i would suggest
love o2o
negotiator
the eternal love (season 1,season 2)
princess agents (not a fan of the ending but my favorite drama, badass female lead)
i started with these dramas :)
but i would like to recommend
story of ming lan
secret of three Kingdom
rookie agents rouge
journey of a flower ( takes time to get used to low quality cgi, but the story is good)
ode to joy (contemporary, slice of life)
scarlet heart (time travel, really really good, the korean version didn't do justice even though i loved them both)
My sunshine (romance)