hi im also a adc main if youd like here are some pointers
1 dont be nervous its just a game its not ranked its just normals
2 practice makes perfect dont get discouraged
3 try not to be caught alone if you do hug tower or run around grab the farm real quick and make it as quick as possible if your fed your a target and if your playing alone noones gonna come save you
4 if you see anyone going to the sides go in the opposite direction they can kill you and try to stay with your team the tanks are your sheilds if you get separated by say janna ult or something dont sweat running you trying to be a hero and dieing without killing anyone doesnt help the team at all
5 try to assassinate squishys unless there fed if they are get back up
6 last not least if your supps talking smack do listen and learn unless there just being jerks then mute em
now as for jinx advice these are rules i live by
1 chompers put it behind the enemy for engage in front for farming the enemy will have to walk around them unless they wanna get caught
2 stay mini gun unless a enemy is outta your normal range or need some extra damage burst damage on farming or a quick poke its situational remember that minigun beats rocket every time
3 chompers give vision dont be afraid to use em as a quick ward to keep from face checking
4 w has insane range and is telegraphed but also has good damage its your main poke if there tower hugging or falling back say hi by trying to zap em it also helps if there engaging or running away with the slow
5 map awareness this is true for all global ult adcs dont be to afraid to ult into another lane if you think you can kill jinx ult needs 2 seconds to fully activate and do max damage plus it does health% so use if there around 30% hp or less and even if you miss you tryed but never initiate with it its a execute
6 have fun your jinx you kill things and if your building right the late game is where you shine