SOCKS5 Proxy Network Setup

I need assistance setting up a SOCKS5 proxy network on an Ubuntu PC using a mobile SIM dongle. The network should be connected to proxysell.com. Additionally, I would like a walkthrough of the entire process.

Requirements:
- Use T-Mobile SIM dongle that’s connected to Ubuntu pc.
- Connect to proxysell.com
- Teach me the setup process

Ideal Skills and Experience:
- Proficient in Ubuntu and network configurations
- Experience with SOCKS5 proxies
- Familiarity with proxysell.com
- Good teaching skills for process walkthrough