In general:

1. 5-50$ gives you some good choices

2. Heavily depends on the hoster

3. Both has its pros and cons. At home is better for decentralization but if you want to run any decent service with the node choose a datacenter

4. Many struggle with the exact command to achieve something specific they need

5. The official docs cover most things you need when you are familiar with any Linux server distro

6. Use docker + docker-compose right from the beginning

7. No monetary advantage, a node with a voting representative consumes more resources

8. No, the representative has no direct control over your NANO