Ah bleach will kill most things like bacteria, I bleached all my rocks/driftwoood prior to putting them into the tank. 1 part bleach to 99 part water for bactericide. Now larvae is a different story... a much higher concentration is needed. I've heard of people using upto 1 part bleach for every 5 part water just to kill maggot larvae, depending on the stage of the larvae.
I would suggest cleaning the tank itself and the filtration system well and let it run for a while before adding things in.
For the wood/rocks/things you find in nature decor,
1) throw it in diluted bleach water over night (kills it faster by making chlorine gas)
2) rinse it
3) let it dry a bit
4) rinse it
5) soak it in some VERY hot water for a couple hours (makes me feel better)
6) rinse it, soak it in some water some more over night, and then rinse the hell of out it again, and let it dry once more over night.
Now you rinse it again so that the city (assuming you live in the city) tap water will kill off some more bacteria from letting it dry over night, and then place in aquarium. It's such a pain but this is the price I pay every time i see a nice rock

I am a bit of a clean-freak so steps 4-5 isn't a necessity, just soak & rinse thoroughly ^^