How can i choose to boot from the second SSD harddisk for a mid 2011 iMac? I am planning to follow the instruction from MacSale to add an additional SSD to a mid-2011 27" iMac (https://youtu.be/eFHvIrdm9So)

It will be placed under the optical drive.



I want to make this drive the boot disk and do a fresh install of macOS to this drive. However the video did not touch on this area.

Based on what I know, I think I can 

1) Start up the system after the installation is complete.

2) After chime, I will use Command (⌘) – Option (⌥) – R combination to boot into internet recovery

3) install macOS to the new drive

However I am not sure how to permanently boot from the SSD drive.

In summary, my questions:

a) Is my plan  of 'internet recovery ' going to work?

b) how to permanently boot from the SSD drive?
In system preferences, there is a selection for startup disk. You should be able to select your new drive.