MVC API

I have the codes below inside of the Controllers in MVC project. This is API project that I tried to learn.
My question is: how can I create end point for Get(int id)? Should I create a VIEW?

My goal is to create end point, and I will have another website project to call the end point so the website can consume the API service.

  public class LeadController : Controller
    {
        [HttpGet]
        public IEnumerable<CrmModels.Lead> Get(int id)
        {
            CrmModels.Lead l = new CrmModels.Lead();
            List<CrmModels.Lead> li = new List<CrmModels.Lead>();
            if (id == 1)
            {
                l.firstName = "John";
                li.Add(l);
            }
            else
            {
                l.firstName = string.Empty;
                li.Add(l);
            }
            return li;
        }
        //Get api/lead details
        [HttpGet]
        public IEnumerable<string> Get()
        {
            //call crm controllers 
            return new string[] { "", "" };
        }
        //create
        [HttpPost]
        public void Post(CrmModels.Lead l)
        {
            //call crm controllers 
        }
        //update
        [HttpPut]
        public void Put(int id)
        {
            //call crm controllers 
        }
        //delete
        [HttpDelete]
        public void Delete(CrmModels.Lead l)
        {
            //call crm controllers 
        }
    }

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