New GP player need counseling. When and vs who should i play GP

Hi, i'm was a main jungler but recently i have decided to change and start playing top (i need a break from being the scape goat when the team is doing poorly). I have been playing a lot of Illaoi and Jayce and been doing good but i would like to play a lot more of GP. What i'm asking is when and vs who should i play GP? And when should i use my Q to farm and when should i use it to poke? And what is the trick to the "invisible barrel" tecnic when you start the chain explosion and after put down a barrel? Tyvm in advance
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