Patience Ruchi. We are just volunteers here and there can be delays in replying.
>> will there be only 1 drive to select from during installation?
Yes.
>> And if I select win10 pro will my win10 home product key work for it
Absolutely not. You would need to reinstall again. It should auto-detect Home/Home SL though.
>>"windows cannot be installed on drive-"
There would be a message after that why you cannot do so. Let us know for the next steps.