Jordanjg99

So I'm new to audis my car was driving perfectly fine and smooth for about 6 days after I bought it the gentlemen told me check engine light was on cause of an 02 sensor, so im in school for automotive tech. One day I was driving 6 days after getting it like a month ago it just died while I was driving had it towed to my school, it was dead when it got towed wouldn't take a jump so I figured new battery there was an agm 94r h8 in it so I replaced it with the same kind then replaced the fuel pump it sounds like it wants to start so bad but just won't turn over I pulled a coil and a plug no fuel getting to the plugs what could I check before I send it off to get ripped off for $$$$