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Do I need to get my Windows 8 key in order to restore it?

You don't need the Windows 8 key to repair your computer. You only need it during/after installation to activate Windows.

If I were to input the manufacturer's key in the Windows 8 installation, what would happen?

You won't be prompted to enter the key since you aren't installing it, you are merely repairing the bootloader. In fact, you could do the same thing on a Win7 computer using a Win8 repair disc/USB.

Now for the dual-boot:

It is easier to just boot into Windows and install EasyBCD once you have successfully dual-booted. I've answered a similar question herehere. Basically you just Write MBR then add Ubuntu in Add Entry. But feel free to use the guide's method as it works too.

Now for the uninstalling of Ubuntu:

Again it is way easier to use EasyBCD - you don't even need to have the Win8 USB. Just delete the Ubuntu entry, click Save and you're done!

EDIT: This is assuming the Windows bootloader is already by default. If it is GRUB instead then you won't be able to boot into Windows, so you'll have to use the repair disc.

IMPORTANT: DO NOT OVERWRITE YOUR WINDOWS PARTITION WHEN INSTALLING OR DELETE IT WHEN UNINSTALLING UBUNTU.

Do I need to get my Windows 8 key in order to restore it?

You don't need the Windows 8 key to repair your computer. You only need it during/after installation to activate Windows.

If I were to input the manufacturer's key in the Windows 8 installation, what would happen?

You won't be prompted to enter the key since you aren't installing it, you are merely repairing the bootloader. In fact, you could do the same thing on a Win7 computer using a Win8 repair disc/USB.

Now for the dual-boot:

It is easier to just boot into Windows and install EasyBCD once you have successfully dual-booted. I've answered a similar question here. Basically you just Write MBR then add Ubuntu in Add Entry. But feel free to use the guide's method as it works too.

Now for the uninstalling of Ubuntu:

Again it is way easier to use EasyBCD - you don't even need to have the Win8 USB. Just delete the Ubuntu entry, click Save and you're done!

EDIT: This is assuming the Windows bootloader is already by default. If it is GRUB instead then you won't be able to boot into Windows, so you'll have to use the repair disc.

IMPORTANT: DO NOT OVERWRITE YOUR WINDOWS PARTITION WHEN INSTALLING OR DELETE IT WHEN UNINSTALLING UBUNTU.

Do I need to get my Windows 8 key in order to restore it?

You don't need the Windows 8 key to repair your computer. You only need it during/after installation to activate Windows.

If I were to input the manufacturer's key in the Windows 8 installation, what would happen?

You won't be prompted to enter the key since you aren't installing it, you are merely repairing the bootloader. In fact, you could do the same thing on a Win7 computer using a Win8 repair disc/USB.

Now for the dual-boot:

It is easier to just boot into Windows and install EasyBCD once you have successfully dual-booted. I've answered a similar question here. Basically you just Write MBR then add Ubuntu in Add Entry. But feel free to use the guide's method as it works too.

Now for the uninstalling of Ubuntu:

Again it is way easier to use EasyBCD - you don't even need to have the Win8 USB. Just delete the Ubuntu entry, click Save and you're done!

EDIT: This is assuming the Windows bootloader is already by default. If it is GRUB instead then you won't be able to boot into Windows, so you'll have to use the repair disc.

IMPORTANT: DO NOT OVERWRITE YOUR WINDOWS PARTITION WHEN INSTALLING OR DELETE IT WHEN UNINSTALLING UBUNTU.

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Do I need to get my Windows 8 key in order to restore it?

You don't need the Windows 8 key to repair your computer. You only need it during/after installation to activate Windows.

If I were to input the manufacturer's key in the Windows 8 installation, what would happen?

You won't be prompted to enter the key since you aren't installing it, you are merely repairing the bootloader. In fact, you could do the same thing on a Win7 computer using a Win8 repair disc/USB.

Now for the dual-boot:

It is easier to just boot into Windows and install EasyBCD once you have successfully dual-booted. I've answered a similar question here. Basically you just Write MBR then add Ubuntu in Add Entry. But feel free to use the guide's method as it works too.

Now for the uninstalling of Ubuntu:

Again it is way easier to use EasyBCD - you don't even need to have the Win8 USB. Just delete the Ubuntu entry, click Save and you're done!

EDIT: This is assuming the Windows bootloader is already by default. If it is GRUB instead then you won't be able to boot into Windows, so you'll have to use the repair disc.

IMPORTANT: DO NOT OVERWRITE YOUR WINDOWS PARTITION WHEN INSTALLING OR DELETE IT WHEN UNINSTALLING UBUNTU.