how to create services n how to use it

You can create a web servie and use with Mvc or web forms ,You can create a web service and integrate its with mvc or web forms 

 

Check these links to create a web service and use with web forms 

 

https://www.c-sharpcorner.com/UploadFile/29d7e0/steps-to-create-a-simple-web-service-and-use-it-in-Asp-Net/

 

Consume a web service in MVC 

 

https://www.c-sharpcorner.com/article/consuming-web-service-in-asp-net-mvc/

 

https://www.c-sharpcorner.com/UploadFile/653eb2/consuming-web-services-in-Asp-Net-mvc-5-application/

Please refer this link on how to create and deploy web service - https://www.c-sharpcorner.com/article/web-services-using-c-sharp-creating-web-services/

 

I feel, MVC would be better choice