Hope this belongs here and not in the 5 series forum. If not, my bad, please move it.
First post, after test driving lots of cars over the last several weeks I finally decided on a 1998 528i.
My first BMW and I'm loving it

The car was bought off a dealer and the vehicle history report showed one owner and no accidents. There are a few issues I'd like to ask regarding a couple minor things with the car:
1. I think my key is screwed up. It works fine to start the car and unlock/lock everything via the physical door lock, but the LED on the key doesn't light up when buttons are pressed and they don't respond. I replaced the battery and I still don't get a the light on the key to respond. I also checked the fuses and the specific one for keyless entry is fine. How much am I looking for to get a new key? Or is there anything else I can check?
2. The trunk release from within the car doesn't work, I press the button and hear the motor attempt to do something but the trunk remains locked. Common issue, quick fix? Checked the fuses on this too.
3. The car didn't come with an owners manual. I've searched but can't find anything for sale online, is there anywhere I can buy one? Or possibly just find a layout of the front radio/climate control buttons (there's a left/right toggle with a fan icon below the climate control display that I can't figure out what it does, it controls a meter on the display, but the meter doesn't seem to affect anything, plus there's some other stuff I want an owners manual for)
Thanks in advance and I hope to be a productive member of this community as I grow in my knowledge of this beautifully driving, awe inspiring piece of machinery.
