Hey Champions of Lol.
This is my first build in here, I'm not lvl 30 yet so I guess you can consider this a 'beginners guide' since it's not testet to the fully yet.
Well, that being said shes a pretty good solo lane'r (except from when against support hero, at least that's my experience). So give it a try, and give some feedback. ^^

Sorry if the spelling is wrong, didn't bother to check it too much..

I'm focusing on the crit with this build, it does som killer damage but makes her extremely squeezy so do not try to be to much of a hero. And for the love of god don't get the 'Greed'.
You might want to switch Malice out with some armor pen.

I prefere 21/0/9 with Tristana. Gives some good damage boost.

Get infinity blade fast as possible, 250% crits = **** yea!
You might wanna switch Madred's Bloodrazor with Trinity Force, or Last Whispere for some armor pen, but that depends on the heros on enemy team.

I focus on Explosive Shot at first cause i'll give you a lot of farm, and I just pick one skill in Rocket Jump at the beginnig for a smooth escape if necessary;)
Then after lvl 6, jam that Rapid Fire for some mean attack speed!

Pros.
Farm
Damage
Crit
Quite easy escape
Killer end game Champion.

Cons.
Very easy to kill
Kinda suck if you dont get enough farm and kills.

I useally rune in pop Exhaust on someone, Rocket Jump out, pop Rapid fire Kill Kill Kill. Rocket jump out if you are about to die, use ulti to last hit or push them away, if Rocket jump isn't enough to get you out of there.
If your laning Rocket jump over enemy and shoot them back towards tower with ulti, will get you some kills too. Especially if your mate has some snare or stun.
But be carefull in early/mid game, to many deaths will give you a huge kick back that's hard to come back from because your so squeezy.

If you play her right and your mates don't suck to much, she's an exelent killer.

Hope you guys find this usefull ^^