If the text is text layers you can link the text layers and with one of linked text layers selected  in the layers palette

and the type tool selected, press the shft key and choose your color from the tool options bar.

Are the lines shape layers or pixel layers?

I don't believe that will work for shape layers.

You probably have change the color on each shape layer.

One possible worksround is to merge the shape layers or merge the shape layers to new layer and then use a color fill layer clipped to the merged shape layers.

Layer>Group with Previous

If the lines are shape layers then they should have grey thunbnail which you can double click on to change the color.

To transform the lines you can select the move tool and move the mouse until you see the double sided arrow and choose any of the handles to transform the shape.

Then you can either double click inside the transform box or click on the checkmark to commit the transform.

You should be able to transform all the shapes by linking them, but you'll still get the distorted arrow heads unless you press the shift

key, but the whole shape becomes bigger then.

There are also some arrows under the custom shapes.

Photoshop allows for more complex editing of the shapes, but it also costs $700 or more.

Then there's the question of which mac operating system your using.

You could use the line tool with the arrowheads turned off to add to the length of the line without distorting the arrowheads.

You might also try simplifying the shape, making a selection of just the line part and then transform just the line.

(right click or Ctrl click on the shape layer and choose simplify layer)

You'll have to experiment and see if that prints out well.