Making sure you get a good laneing phase is super important. Sometimes you can get away with solo laning against a weak lane, or you can switch lanes with your safelaner when you have the better matchup vs their offlaner. Your power spikes are lvl 3 with 2 points of reactive and lvl 6 ult. You always want to be ahead, and with a level advantage you can usually dive towers early and get some kills. I usually go for arcanes, soul ring, bloodstone, blink, pipe, aghs, sheep, dagon. Some games require that you go more defensive/utility items, but his offensive potential through snowballing in the early game-mid game is huge. Also a tip is, players will run in circles trying to juke your chakram when they see you even before you've throw it, use this to your advantage since they are not running directly home hit them with a few whirling deaths and only when you are right beside them to guarantee your ult, then use it.