Directions Widget and closest facility widgets

In order to use these two widgets I think I need to create Network Analysis service like the one below.

http://sampleserver6.arcgisonline.co...NAServer/Route

The problem is I don't have any clue on how to do this? I just purchased Network Analyst extension for ArcGIS and also have it as part of my server.


I have a couple of questions:

1.) What is the simplest way to create a service that will allow me to use the directions widget?
2.) Can you provide me a link or something that shows an easy way to do this.
3.) Do I need to have streetfiles because I currently don't have any of those I don't think.
4.) For the closest to facility can I use my own layer?

Thanks in advance for your help. I wish they had not taken away the free network analyst service. Seems like my timing is bad.