3, would it be a good idea to save it onto a flash drive? Not sure
Actally it is a good, idea, you don't have to check "add shortcut" So you don't have to rename the shortcut "old blockland" and you don't have to put the blockland shortcut for v21 on the desktop again.
To install, make sure it's installing in the flash drive, and un-check everything (Including desktop shotcut) and install on here.
Now jeep, can you post a tutorial on how to host a server?