Car starts but won't shift out of park, brake depress light won't go off. on 2003 Audi A6 Quattro

Am about to start on a major project (replacing turbos, timing belt, figure out torque converter problem) on my 2003 A6 2.7tt Quattro. Has been sitting idle for almost a year and battery was dead. Just installed new battery and got the car to run, but can't get it to shift out of park. When depressing the brake pedal, the brake depress light will not go out on shifter panel. Also cannot get my OBD to link with engine. When the key is on, not running, the door lights will turn on, then start blinking. I am wondering if I have an alarm issue due to the battery being dead for so long.

This all is a huge project definitely check out and read all the work procedures before starting any o the work. Either a Bentley workshop manual or there is a company that independent auto repair shops get their information from, this same information is available inexpensively for people that work on their own cars.. The information is year make and model specific, covering repair procedures, torque specifications, fluid capacities and specifications, service bulletins, component locations, wiring diagrams ect.... Alldata is very easy to navigate
If you are doing that much work you will like Alldata.