I just picked up Ziggs and I'm already having a blast with him. I typically play Top with him, tried mid and just didnt work for me. Nees help with build style and position/skill level up order that anyone has found effective. Thanks everyone!
Max q. Mid is where he was designed to be.
Go mid. Max Q>E>W>R.
Rush 
, but still try not to spam abilities too much on farming. Save mana to harass with Q.
Then just watch the map, and farm like mad. Use your Ult to change fights in other lanes, if you can.
You definitely want to play Ziggs mid so your ult can impact the other two lanes. Just sit back near your tower, waveclear, and get items. Ziggs gets quite strong once his AP gets up there. As for builds, there are tons of great ones online. Just do a search.
Early game as Ziggs, abuse your AoE damage to press the enemy under the tower. Enjoy the fact that you have very, very, very good farming potential and that your cooldowns are relatively low -- along with a good passive that can fool enemies into attacking you when they thing you've exhausted all your damage via spells. Focus on clearing the enemies minions, pressing them under tower, then harassing them with Q-tosses to force them to either DODGE, or take the hit and get CS. They can't pick both if you're predicting/leading them extremely well.
Chalice. Sorcerers boots. Rylais, Ludens, Rabadons, Hourglass. Best items for his kit, but you're free to customize based upon the match. Once you get to 6, harass other lanes for your allies to pressure the enemy under their towers. The bomb falls faster the closer you are to the target, so try to get as close as possible. Always keep an eye out for enemies that are recalling in obvious spots to bomb them.
Play mid lane. Not top. You lose your potential power in your ultimate if you go top to limiting yourself to 2 lanes of fire instead of 3. Also you lose dragon potential, and Ziggs is great at objective control like dragon.
Ziggs
(Early Game) In early game I usually buy Doran's Ring, sometimes I buy mana potions depending on who I am laning against. Ziggs AD is a little better than Fiddlestick's. (Fiddlesticks early game AD is AWFUL.) So you want to make sure you last hit all of your minions. And you can occasionally use your Q on the minons but know that your mana isn't the best early game. Make sure you save up to buy Arch Staff first. Then depending on who you are laningyou could buy Raylais. Just try not to feed the other team or get ganked.
(Late game) Ziggs can't do anything up close. The combo I use if I get ganked is , W, E, R. I use W to bomb myself as far away from them. Then, I throw down my E to slow them, and my R to get massive amount of damage on them. (Ziggs Ult can be very effective in team fights.) And if they have very little health I use my Q and that usually finishes them off.)
(Team Fights) Usually in team fights champions are all right next to each other. Either all killing 1 or 2 champions or just waiting for a fight. This is where Ziggs can show his true abilitys. I usually Q there whole team, then I use my W, and then E. I try to aim it towards their ADC or AP champions. Never use all your spells on their tank. And let your team help you and once they are all weak or close to weak use your R. Keep scaring the off with your Q because the cool down reduction is 5 seconds. And it does a massive amount of damage.
Ziggs champions that he can bully. Ahri: Ziggs Q and W bully her down the lane from my experience. Teemo: Teemo cant handle Ziggs late game. His Q does MASSIVE amount of damage and he's super easy to kill. Thresh: As long as you dont get pulled you do a lot of damage to him causing their support to fall apart. Try to stay away from Thresh and get behind minons.
There is alot of more champions that Ziggs can counter easily but those are the most vulnerable.
Champions Ziggs cant handle Early game or late game. Fizz Blitzcrank Udyr/WW Mater Yi
