I am thinking to buy a new computer. Fun. Wondering what you guys use?
I use an Android phone and that's what I trade on. It's a mobile office for me.
Do you have a VPN or a personal Hotspot?
Any regular data will be fine provided it's fast.
Mac or a DELL?

This is immaterial. Any laptop in good shape will do for trading.
Also, antivirus is a good thing to consider too when it comes to the Internet. Safeguard your system.