I need to know what cards usualy go in them, and how effective they are, what are there weaknesses, and strong points, im sure there are many different types, but i need to know how to make an advanced format one, please help..................

just go to the deck depot area of the forums and youll see a ton of them

i dont get why ppl keep posting chaos decks, they all look the same, and one or two cookie cards of difference is not a whole new deck

A real chaos deck? This involves all sorts of dd monsters. Or is it a cookie cutter, frowned upon, hated, spat upon, ruining-the-game, unoriginal, boring, nefarious black luster soldier deck?

Chaos decks basically revolve around the BLS Envoy of the Beginning card. They base most of their monsters around Light/Dark to fuel the BLS. Common cards in a chaos deck are Kycoo, DDWL, DDA, Blade Knight, etc.

As the above poster mentioned, you should check out the Deck Depot forum as there are many chaos decks posted there.

What happened to originality ( i think that is a word <_<) )...lol stupid BLS...-_-

LOL BLS Haters... you do realize it's just a piece of cardboard, right??

Pff... anyway...

To build your standard, run-of-the mill CCC (Cookie Cutter Crap) deck, you basically just take the most powerful cards you can find, make sure you have at least 5 non-Tribute Lights/Darks each and your Tribute Monsters consist of BLS-Envoy, Jinzo and Airknight and you're done.
Just scan through the Limited list, most of the cards on there go in a CCC deck.

To add BLS to any other deck, just make sure your Lights/Darks are balanced.

To be original and build a 'proper' Chaos Deck, you need to focus on the RFG aspect of the game, using cards such as Banisher Of The Light, Bazoo The Soul Eater, Gren Maju Da Eiza, Dimension Fusion etc.
I had a really cool deck like this once... God knows where the Thread for it went though...

There are several Chaos builds. The general BLS-chaos involves whatever LIGHTs and DARKs you want in the deck that help you win. BLS is then added because the number of LIGHTs and DARKs are balanced. Examples include Magician of Faith, Thunder Dragon, Breaker, DD Warrior Lady, Kycoo, Airknight Parshath, Cyber Jar, and DD Assailant.
Next there is the Warrior-Chaos, which is all the warrior suport but a chaos twist. Cards include Blade Knight, DD Warrior Lady, DD Assailant, Mataza the Zapper, Reinforcements of the Army, maybe a Maraudign Captain, and BLS.
There is also the Phoenix Chaos build which makes use of Apprentice Magician, Magician of Faith, and Hand of Hephtys to get out Sacred Phoenix while having enough LIGHTs and DARKs to get out BLS.
Then there is the Zombie Chaos, which is the usual Zombie build (Puramid Tutle, Vampire Lord, Ryu Kokki, Spirit Reaper, Regenerating Mummuy, etc) and some LIGHTs included (Magician of Faith, Thunder Dragon, etc) to get out BLS.

At least that's what most consider Chaos.