Controller:

using System.Web.Mvc;
using Umbraco.Web.Mvc;
using My.Site.Models;


namespace My.Site.Controllers
{ 
    public class FeatureBlockController : SurfaceController
    {       
        [ChildActionOnly]
        public ActionResult RenderFeatureBlock()
        {
            var featureBlock = new FeatureBlockModel { Desc = "Welcome", Media = "/media/test.jpg", Title = "Hello" };
            return PartialView("FeatureBlock", featureBlock);
        }
    }
}

Model:

namespace My.Site.Models
{ 
    public class FeatureBlockModel
    {
        public string Title {get; set;}
        public string Desc {get; set;}
        public string Media {get; set;}
    }
}

View (~/Views/FeatureBlock/FeatureBlock.cshtml):

@using My.Site.Models
@model FeatureBlockModel

<h1>@Model.Title</h1>
@Model.Media<br />
<p>@Model.Desc</p>

In you template, call the following:

@Html.Action("RenderFeatureBlock", "FeatureBlock")

Note that this is almost exactly what you would do in "normal" MVC so if you need more info make sure to also look at resources about simple ASP.NET MVC.

Hope this helps!