So i am Silver 5 and loves to play ADC. I can do well in lane but idk where to be in team fights i just die at the start and then we lose the fights. If i don't die then we win the fights, but i don't get much peel so i need help.
My main ADCs are: 
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and maby 
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Making phase: Stand behind your minions. If no minions stand behind your support. Draw an invisible straight line between you and the enemy champions. Keep something between you and them at all times. The following champions are exceptions of this rule: 
Team fighting phase: Ideally your team should line up like so: ADC + Mage >> Support + Assassin >> Tanks + Bruisers Backline >> Midline >> Frontline
Backliners deal damage from safety. They should avoid close range fighting at all times. Backliners are the primary wave clearers and turret siegers. They should attempt to poke the enemy front liners to wear them down. They should always be aware of enemy threats and buffer themselves from threats via teammates, towers, walls, etc.
Midliners consist of supports and assassins, but they are here for different reasons. Assassins skirt around the outside of the fight and look for an opening in order to nuke the enemy backline then get out before they can be retaliated upon. Supports are here to protect the back line and peel when necessary. They can also lend a hand in initiating fights but defending their backline takes priority over this.
Frontliners attempt to disrupt and separate the enemy formation in team fights. They want to take the brunt of the enemy 's damage. They purposely take aggro so that their fragile teammates have an opening to focus down the enemy carries. When taking objectives such as dragon, baron or turrets they attempt to take the aggro from these sources while everyone else focuses them down. They also take over peeling duties when the support rotates into the front line.
IDK I kind of gave up on ADC because my positioning sucked. That and toxic supports I got paired with. Might help to watch some Diamond ADC streamers or get a better mouse.
Never be the first one to engage rule #1. Always stay somewhere near your tank and try to focus their damage sources.
You just get used to it, hard to really explain, but you'll learn
stay in the back and upgrade your yellow trinket if your team doesn't ward. That way you'll be better able to see people coming in from the side and back Don't waste your escapes at the first sign of danger, use them them when absolutely necessary to your survival. You want to use your escapes and cc skills so that you'r opponent doesn't have any too. For example if a leblanc comes at you when you're a vayne wait till she uses her mobility skills to get to you before using condem that way she'll have a harder time reaching you.
Attack what you can, AND ONLY WHAT YOU CAN. You do not dive for their squishy adc/mid unless you can (whether you can or can not takes experience). If need be, you sit in the back and attack their tank.
Bottom line is always: attack what you can safely
