Tom,
Welcome to the forum. Lots of great resources here.
Answering your questions in order:
1. I use Seni tape on for easy on/off without the need to undress. They are cool in the summer, have a range of absorbency, and are quiet under clothes. Great for an active lifestyle. Changes can be done quick, and they’re pretty slim, so no one’s the wiser.
2. I recommend a cover like the Gary active brief to conceal and prevent leaks. Don’t get me wrong, these will leak , but usually give you time to change before wetness makes it to jeans. They’re also breathable and feel similar to brief underwear when worn with a tape on that’s thinner.
3. If you’re lighter at night and not losing a full bladder, the same Seni will work. If you’re heavier at night, I’d look for something more absorbent. Lots here like Northshore, Betterdry, Confidry 24/7, and similar plastic backed.
Good luck and after a while, you don’t really notice it anymore. Plenty of other things in life to worry about.