placeing tiles perfectly for an isometric map?

I am literally brand new to Unity and I have loaded in an image of a tile I would like to set, I would simply like to set around 30 tiles which can be done by copy and pasting the image into the hierarchy 30 times and dragging them, but I'm having trouble aligning the tiles perfectly. Does anyone have any tips? Tutorials for creating Isometric maps? Thank you!

 

Holding down CTRL+V enables vertex snapping, this may help.

 

You might also benefit from this article:

http://www.alanzucconi.com/2015/07/22/how-to-snap-to-grid-in-unity3d/

It shows how to set up an editor extension that allows you to snap objects to a grid, which would make you placement easier.