Vel'koz buying order and skillshots?

Hello , i decided to otp Vel'koz (only supp by now) this season. So far ive climbed myself out of bronze 4 to silver 3 , and i hit some obstacles. -Im incosistent , can hit 0/12 and 9/2 next game - I have hard time hitting skillshots, how can i improve? - I dont know in which order should i buy items. So far my usuall bulid goes like spellthief (950 g supp item) -> Basic shoes ->Ludens Echo -> ??? Damage or slow
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