I wrote this guide for the avg person who really wants to have fun killing people.
Just purchase these items, play the char and have fun. You really cant go wrong no matter what team you face. It's not a perfect build it's just funny to hear as you run around YOU HAVE SLAIN AN ENEMY!!! GOD LIKE!!! TRIPLE KILL!!! If you really just want to have fun with not much effort this champ is the one to do it with.

PS I'm kinda lazy so this is a just try it you'll like it build. Please feel free to modify it any way that suites you but this is how I build him. And farming gold is easy.
Last thing Make sure at level 12 and on you keep the blue buff on you. If you do you can run around with your poison on non stop. I like to make fake trails so they think I'm headed one way and they go the other way right into our gank.

I want to say you can build him towards the end of the game depending on AD or AP but you really shouldn't even be dieing at all and just running through them like they cant do anything because if they try they will die. But guess what they will always chase you and they will realize there going to die if they keep chasing you so go back and fling them into your poison and try to just keep harassing them, it is so fun!! I can't explain it you just have to try it.
Now last thing sometimes I am killing so much without really taking any damage I will switch to more AP and not get the last piece of armor and I will get a Rabadon's death cap. then the poison does loads more damage.