A computer is necessary for the transfer of script and recovery images to the phone through USB. For example, in some cases you will need to use ADB to move the following files: (adb push /path/to/local/file /mnt/sdcard/path/to/file) to the phone.
If you want to root ZTE Warp you need to use One Click Root. Download and extract the archive and run the WarpDrive.bat file. Wait for the process to finish and you're all set: the phone is now rooted.
In order to create a hotspot, please go to Settings > Wireless and Networks > Tethering and enable it. Use the settings menu from that location to configure password, SSID and encryption mode.