You can actually create and add up to 5 Instagram accounts to each device.
In the beginning however, I suggest that you just start with one and scale up from there.
After downloading the Instagram app from the Google Playstore and/or the Apple Store, the next step is to create your instagram account and verify it using either your phone number or email.
After signing up at Instagram, set up your profile. As you can see from mine above, it is best to start each line with an eMoji then a sentence. At Instagram you can have 5 lines and then a clickable link. I suggest that you utilize the 5th line for your call to action and use down arrows as I have.
If You already have a facebook Business Page You can also connect it with your Instagram page as Instagram is owned by Facebook. Facebook bought Instagram a few years ago for $1,000,000,000 Yes 1 Billion Dollars with a B!