Stupid. He asked for advice regarding a Demon Hunter..
Sry cant help you there!
how to run ACT I bot? i tot DB only able to run ACT III ?DH's are hard to bot, specially on Act3 due to DB's trying to melee the mobs. You need to build a tanky DH with balanced damage and survival. Since this is not the best, nor the cheapests of the builds, its best to farm Act 1 or Act 2 where you will need a lower survival to be able to complete runs without dying.
I'm actually farming Act 1 with MP1 with this build without problems: Demon Hunter - Game Guide - Diablo III
Also Giles Trinity Combat routine is better than Belphegor for DHs.