Need advice for duel welding dagger build

Hi! I'm practically new to this game as I only started picking this game last steam sale and I'm giving it a try now. I tried the bow build before but i got killed every time an enemy gets near me or cant deal with hard bosses. Any advices on how i should build my dagger build? Also what does the other combat trees like athletic and combat mastery focus on or which build is it suited for?

Thanks everyone in advance as I'm stuck on deciding what to do.