About 3: How do I move the task bar to the bottom of my screen?
Click on "Show Applications" (the 9 little dots in a square). Type "Settings" and open this. Go to tab "Appearance". In the section about Dock select the "Position on screen" to your desired position.
Creating a Full install Ubuntu SSD from a Prebuilt Image File
Download Image File: https://phillw.net/isos/linux-tools/uefi-n-bios/dd_unb_ubuntu-20.04_15GB_2020-06-26.img.xz
Download Rufus: https://github.com/pbatard/rufus/releases/download/v3.11/rufus-3.11.exe
Double click Rufus exe file. (No need to install it).
Select USB2 Target drive in Rufus.