yankeez

I posted a problem with my Audi A4 but can't find it and somebody else put there problem on it. I would REALLY appreciate help.
I change my car battery 3 months ago. I tried to start my car two days ago and it wouldn't turn over. I tried a couple of times to turn it over and the check engine light started flashing and stopped half the cylinders. I charged the battery over night because the battery was below 10 volts. The next day it charged fully and I tried to start it again and no luck. It wouldn't turn it over. I scanned it with Vag-com and it said I had a leak in the EVAP hose, 2 codes it wouldn't read because it's not registered, and cylinder 4 miss fire.
I plan on registering it but I don't have the money if I have to get a starter.

PLEASE HELP! I'D APPRECIATE IT!