Hi, I am Panvicka. I am Silver 2 (I know that my div is bad, but Stylosa once told me that rank does not matter!), Tristana is the only ADC I know how to play. Fun fact : I hate palying ADC
I obviously have Mastery 7 on her. I recommend playing her with your duo support, because you can communicate better.
Pro tip : Never blame your team for your fault (Even if it's their fault).

+Pros
-Has great damage
-Isn't that hard to play (She has no skillshots)
-Has great skins
-Has great voice and voice lines
-Has everything that ADC needs (Attack range bonus,
Attack speed bonus, great push, great dmg,
one of the biggest jusmp in the game, and Lee ult)
-Kills tanks in a matter of seconds
-Cons
-She is an ADC
-Needs items to do something
-You'll be focused by the enemy team

-Passive Draw a Bead is great passive it out ranges almost every champion is League. It gives bigger range to your E an R too.
-Q Rapid Fire gives her attack speed, use it mainly when you put your E on someone
-W Rocket Jump is awesome escape and engage tool, it does more dmg when your oponent has your E on them, it resets on kill and on exploding your E by your auto attacks
-E Explosive Charge is a great damaging spell, it is an point and click AoE spell that you can pump up with your auto attacks, the more you pump it the more dmg it does. You can use it on turrets.
-R Buster Shot is a great knocback, it scales with ap (That's why I build Guinsoo's on her)

The basic putting E on somebody and then explode it with your auto attacks,
then the same one just with jumping on them one auto attack before it explodes,
the same combo + ulting them away.