Your key role is initiation and hero-kills. So, you have to farm a lot. Don't bother farm and deny all creeps on the line and in the forest

Your cast looks like: BKB -> Dagger -> Mignight Pulse -> Blackhole -> Refresher -> Mana Boots -> Blackhole.

After your procast is given you should go farning/pushing. DO NOT FORCE FIGHT FURTHER AND DO NOT ACCEPT IT

You will lack mana, so use it wisely. Don't buy clarities or mangos, you have Soul Ring and Mana Boots.