answer for Q no. 2 Please press "WIN+Spacebar" when you want to switch IME

answer for Q no. 8 Please disable your USB selection suspend in power option from the control panel.

answer for Q no. 9 Streamyx/Unifi/Maxis Fiber/Time is better choice. Don't use 4G since it has limited by bandwidth usage. Switch to fiber broadband so you can let your Windows 10 doing windows update automatically.