and use it to generate a few sats as income every day

Please read these guides:

• https://darth-coin.github.io/nodes/recommendations-ln-node-operators-en.html
• https://darth-coin.github.io/nodes/lightning-node-maintenance-en.html
• https://darth-coin.github.io/nodes/private-ln-nodes-en.html
• https://darth-coin.github.io/nodes/private-ln-channels-types-en.html
• https://darth-coin.github.io/nodes/managing-lightning-node-liquidity-en.html

and many more I wrote. I also posted many others on SN, see my bio https://stacker.news/DarthCoin

To answer quickly your questions:

1. Yes, for a public node, yes. For a private one is enough 1M to start.
2. Depends what do you mean as "password"
3. You cannot "control" automatic channel closure. Is a feature not a bug and is named unilateral exit. Please read my guide for more details
4. Read my guides.
5. Yes is possible but not really lost, only that you cannot access them, are in a zombie channel. Sometimes is possible to recover the access but only with knowledge and hood tools. So start reading and learn more.
6. For any other questions please read ALL my 60+ guides.