Shrub Recommendations - Hedging
I'm a complete newb when it comes to gardening. I'm looking to plant some shrubs that would allow me to create a hedge such as the attached picture.
I checked out a few nurseries plus lowes and found something called a green mountain boxwood.
1) Is it easy to maintain?
2) Does it grow fast? How long will it take for me to grow it to a point that I can create a hedge?
3) Should I buy the 3gallon or 1gallon plants? the 1 gallon boxwoods are obviously a lot cheaper but worried that will take too long to grow out.
Any other recommendations and advice is greatly appreciated.

I checked out a few nurseries plus lowes and found something called a green mountain boxwood.
1) Is it easy to maintain?
2) Does it grow fast? How long will it take for me to grow it to a point that I can create a hedge?
3) Should I buy the 3gallon or 1gallon plants? the 1 gallon boxwoods are obviously a lot cheaper but worried that will take too long to grow out.
Any other recommendations and advice is greatly appreciated.