You should have a sign that meets in the center of the room.
How to get a straight line for hardwood flooring.
Take a chalk line and snap it over the middle of the room to connect two center points across from one another.
Drill one pair of holes every six inches down the board and place the holes.
From there measure the width of the plank plus 1 inch into.
Pry off with a prybar any baseboard or molding from the longest wall in the room that runs perpendicular to the floor joists.
Or pop a line 2 or 3 boards rows out and dry lay to the wall.
The first row of flooring should be this distance from the wall on the wider end of the room.
Then go to the adjacent wall and snap another chalk line across the room.
With it dry laid and tight top nail next to the wall to hold that row then remove the spacer boards to your line and blind nail with your trim gun until your flooring nail will fit without hitting the wall.
How to find a straight line when installing wood flooring.
Get tips off this video.
Drill pilot holes through the board to prevent the flooring nails from breaking and to avoid splitting the wood.
Snap a chalk line between these marks or use a laser square to pencil a line.
Connect both pairs of marks on opposite walls with a chalk line.
Pop your line out into the rooms through the archway squared up to the walls start there and spline lip tonge and go both ways.
Stretch the line to the far end of the course and put it right on the corner of the end of the last piece on the side closest to the wall.
Measure 12 inches in from one end of the wall.