This jayce build is made out off mostly blue items dats why its called blue build

Cons: he is weak early and early mid game so you need to play lane a bit pasive and farm
Pros: Stronger late game then normal Jayce
Strong burst late game

You need to farm a lot early and mid! you need a lot off items to do something dont push to much and remember to ward so the jungler dont gank you

Before: before fights you poke with you e+q and stay far behind so you dont get in a bad position so they can engage on you

Engage: you are not the one to engage a fight say to a tank they shall go in

In the teamfight: when the teamfight starts you wait to the tank are dead then go in on the carrys if you kill a carry you back off so you dont get bursted and you starts poking the rest off their team

After: jayce is good at killing towers so you start pushing and you should get a tower or two if you get a inhibitor you should go for baron or dragon or rotate to kill another inhibitor depends on how long time you got till they respawn

The standart combo is: you start in ranged form and then you e+q then you switch to melee and uses q+w+auto attack+e and then the enemy should be dead depends on how late in the game you are

More advanced combo: you start in melee and then goes up in their face and you e+q+w+auto attack and then you switch to range and use e+q+w and starts auto attackin

spells depends on what you are agains

ignite is when you think you can dominate your lane and get kills but its not that safe

tp is when you dont think you are be killed that much and dont think you are getting kills and just want to farm and make tp plays its a pretty safe spell

exhaust is when the enemy have a lot off burst like leblanc so you exhaust them when they go in on you its a good spell for 1v1s

barrier is when you are agains sombody whit damage over time or agains sombody whit true damage

Cleanse is when the enemy have a lot of cc like malzahar