I don't play arc anymore because not in meta and very hard to farm early game in high mmr.In early game you have to keep track of your clones midas cooldown. Whenever your clones midas is off cooldown then you summon him on a lane or jungle to midas and farm until you have maelstorm then boots. Then you let clone tp push on empty lanes and farm jungle until you get bkb. If your team is winning then you push with them, if not you play rat dota with the clone tp push forcing opponent tps to deal with arc clone. I suggest you make clone combo key different from faio key as clone will stop pushing and run to you if you use same key. Builds vary from game to game but hex is a great item to chain cc someone to death. Once you hit 6 in early game you have a great kill potential, so save clone to fight until you have midas.