>>Iwant to build a new cage for my two collards. What would be the best size? Also what type of wood it safe to use? I have read that cedar and pine could be dangerous, but other places have said that pine is safe. I can't find anywhere that gives a definite answer.
Cedar and pine are Frowned Upon as bedding material, but it's doubtful your lizards could get "sick" from said wood being used solely as cage framing. I built a 8x4 cage with treated pine as the framework, sort of with collared in mind, but now it's used as a summer home for my box turtles (I STILL don't have any collareds). 
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Chris McMartin
www.mcmartinville.com
I'm Not a Herpetologist, but I Play One on the Internet