Noob needs help with Disk Brakes

Just received a Charge lender 2012, my first bike with disk brakes. I went for a ride around the block and the rear rotor was rubbing so I read the manual and tried to centre the brakes. The problem is I think I've loosened the wrong bolts on the rear calliper, so when I've pulled on the lever some brake fluid has come out. I tightened the bolts up and now the lever is really spongy in fact it nearly touches the grip when I pull on it and now the rotor is squeaking which I'm guessing is because it's got brake fluid on it.
The brakes are Avid Elixir 1
Any help gratefully received as I've only had the bike a couple of days.
Thanks
The brakes are Avid Elixir 1
Any help gratefully received as I've only had the bike a couple of days.
Thanks
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VOODOO CANZO
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Epic bleed kit