2003 Cadillac DeVille Questions

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Also when driving it feels like it down shifts or drops rpms
Abs, traction control, and emergency break lights all stay on
Every time I shut off car I have to jump battery n the anti theft light comes on but will start with a jump the battery is good I had to break in to my car through the trunk n ever since this is how I have to start my car
what causes the engine to retain high idling after initial startup? (but not a rough idle)
2003 Cadillac Deville

B0429 - Temperature Control #3 Rear Circuit Range/Performance
C0625 - Left Rear Position Sensor Malfunction
C1241 - Variable Effort Steering Circuit Malfunction
P1416 - Secondary Air Injection (AIR) System Bank 2

Which of these should I be most worried about? What should I get fixed first?
clicking noise from middle of dashboard - is related to A/C door actuator
The car drives and stops good
Leaking brake fluid. Not leaking at any wheel or caliper. Some where in line. Leaking in front left. need routing diagram of line.
The car starts and runs great. I have to disconnect the battery so it doesn't die because I can't turn the ignition all the way off therefore it will not come out
I tried to jump start my car by using the fuse box/relay area.
The whole driver side panel fell off while I was closing the door. I was going to remove the car from the garage before going to work This is the first time it has happened. I am assuming whatever holds the panel to the door broke off.
2003 deville. Battery reads good. Car will not turn over at all. Just died. No lights. Nothing. Is it altinator?
for a 2003 DHS Cadillac
My lights came on automatically when I started the car now they dont
Some days may drive good idle around 600.
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