If you are currently running macOS 10.13+ then the new OWC SSD should be visible when installed internally since the MBAir should already have the necessary system firmware required for communicating with the OWC SSD. The OWC SSDs require macOS 10.13+ in order to see the SSD.
You can boot the original Apple SSD externally and run CCC to clone the macOS system to the new internal OWC SSD after you first erase the OWC SSD using Disk Utility. Erase the new SSD as GUID partition and APFS (top option). If you don't see the OWC SSD, then click on "View" within Disk Utility and select "Show All Devices" so that the physical drive appears in the left pane of Disk Utility.
Disclaimer: I don't use Bootcamp or Windows so this may contain inaccurate information:
As far as the Windows partition I'm not sure you will be able to clone it. I've seen posts on these forums where resizing partitions will stop Windows from booting since the Windows' bootloader is unable to locate the Windows system files. I think your best option is to use Bootcamp Assistant to resize the partitions for a new Windows install and install a fresh copy of Windows. I believe Windows may include an option that can allow you to migrate the old data to the new drive, but I've never personally done this before although I did notice such an option on the Windows Start menu one time a while back.
I believe WinClone will only be useful if you are restoring a Windows installation to the exact same physical location on the drive. I may be wrong here, but I believe this is correct from what I've read on other posts. Of course you if you have the time to experiment, then maybe you can prove me wrong here. I wouldn't mind ;-)
