How do i know which wheels will fit my bike? my bike is: https://www.giant-bicycles.com/au/xtc-27dot5-2-2014 and everything I have came with the bike, only now the axle of the rear wheel bent and the skewer has lost its grooves.

and I would like to replace the rear wheel with the 12 x 142mm version of:
http://www.chainreactioncycles.com/au/en/easton-ea70-xl-mtb-rear-wheel/rp-

I want to reuse the old casettes and disc break. I was told to buy new rotor bolts, will these do? http://www.chainreactioncycles.com/au/en/hope-steel-disc-rotor-bolts/rp-prod9950

Will I be able to migrate all my previous parts onto this new wheel and will the wheel fit onto my bike?

update:
A replacement axle would be prefered. What axle would work for my bike?
Unless the Oz version is different from the US version (which it doesn't seem to be; the picture is the same), it looks like this bike uses a by default regular old 135x5 mm quick release, so the wheel needs a quick release compatible hub (not a thru axle hub).

Have you tried servicing the existing wheel? QR skewers and new axles are way cheaper than a new wheel (but of course, thru axles are stronger, so the upgrade may be worth it anyway).

Edit: It looks like Giant has a conversion kit you can buy to go to 142 x 12 thru axles wheels. 

A picture of the kit is here:



Looks like the two pieces on the left screw into both places where the skewer passes through, then the hanger is replaced as well. You can see this video on how to install it. 

It also looks like you need a particular thru axle specifically from Giant due to threading; it looks like its a re-badged DT Swiss thru axle, so maybe they have something compatible.