TOPIC: How do I know what line screen and mesh count I should use?
It's very important not only to choose a proper line screen for your art file to capture detail, but it's equally important to choose a proper mesh count that works with your line screen.
Here is an accepted formula for determining the mesh count.
Multiply your line screen by a factor of 5. Take the equal or next (higher) closest mesh count (i.e. Line screen of 45 x 5 = 225 so choose a 230 mesh or higher).
(i.e. Mesh to line screen formula is in reverse 230 mesh divided by 5 = 46 (line screen). 46 representing the "highest (finest)" line screen count that should be applied to a 230 mesh.