AUDI 98 1.8T Quattro -> What should I do 1st? Any help, guideline, anything... to fix that mess!?

Address 01 Component: 1.8L R4/5VT MOTR AT D01 Coding: 06251 5 Faults Found 18010 - Power Supply Terminal 30: Voltage too Low P1602 - 35-10 - - - Intermittent 16825 - EVAP Emission Control Sys: Incorrect Flow P0441 - 35-10 - - - Intermittent 17544 - Fuel Trim: Bank 1 (Add): System too Lean P1136 - 35-10 - - - Intermittent 16839 - EVAP System: Large Leak Detected P0455 - 35-00 - - 17881 - EVAP Leak Detection Pump: Open Circuit P1473 - 35-10 - - - Intermittent Address 02 Component: AG5 01V 1.8l5VT USA 8508 00532 - Supply Voltage B+ 39-10 - Output won't Switch or Short to Ground - Intermittent Address 08 Component: A4 KLIMAVOLLAUTOMAT_D75 00787 - Temperature Sensor in Fresh Air intake duct (G89) 30-10 - Open or Short to B+ - Intermittent Address 35 01367 - Central Locking Pump Run Time Exceeded (Likely Leak) 35-00 - - 01371 - Alarm triggered by Door Contact Switch: Driver's Side 35-00 - - AND MORE.... Who can help? rip669 at hotmail dot com Thank you