If you are adding the object from an empty, rotate the empty so that IT’S axis is facing the direction you want to add the object. If your not using en empty, the same principle will work, except you might not want to rotate the object. It’s generally a good idea to stick to a standard of having all objects face the right direction of the axis. You can see an object’s axis by selecting it and clicking on axis on the left side of the edit buttons screen.
I generally have the front of the object facing the y axis, and the top of the object facing the z axis. You can rotate an objects mesh (to change the way it’s facing based on it’s axis) by going into edit mode, selecting all the vertices, and then rotating them as need be.