Yep....I ordered 600 Norway spruce plugs (seedlings) as I am doing the same. Norway's are the best for a road screen as they keep their lower limbs and are very deer resistant. Planted in 3 rows at 10x10 or 12x12 foot spacing you will have an impenetrable screen from trespassers and people looking from the road.
They do get big though....so not sure how big of an area you are looking to fill.
I planned on doing a zigzag pattern keeping them 10' apart, I figured if I loose a tree from damage down the road(like from a larger tree falling on them) there will still be enough cover, it will also allow me to cut down one side of the zig zag when the trees get larger so the trees will be more like 15' between them which seems to be nice spread when they are larger.
These are my thoughts that have been confirmed by a few guys, but I'm open to hearing other ideas, just concerned with needle cast in the future as they will be in a wooded lot and not out in the open so there will be very little airflow.
I'm not looking to keep everyone from seeing everything, just a bit more of a screen since I've taken most if the underbrush out and removed a bunch of trees from the area for a future pole building so I'd like to restore a bit of the privacy.