This is my first build. Not too sure how the sequences go for abilities but basically you want to get your w first then e,w,q,w,r. Max out your w before anything and your r when possible. And leave your q for the last thing leveled.

To farm Pillar of flame a set of 3 then conflagration one of the three and it should kill them all. When harrassing I like to drop my pillar a little bit behind my target because they almost always run backwards right into it.

Some things to remember is in fights pick a squishy e,q,w,r and they drop like flies. Always try to come in when fights have already been initiated.

Sorry for not alot of detail. Just wanted to get the main gist of my build out there. It works so well for me. Its a slow build in the beggining but if you play smart you will build fast. And always farm farm farm