film.js

export default {
 title: "Film",
 name: "film",
 type: "document",
 fields: [
   {
     title: "Name",
     name: "name",
     type: "string",
   },
   {
     title: "IMDB Link",
     name: "imdbLink",
     type: "url",
   },
   {
     title: "Trailer link",
     name: "trailerLink",
     type: "url",
   },
   {
     title: "Image",
     name: "image",
     type: "image",
   }
 ]
}

schema.js

// First, we must import the schema creator
import createSchema from 'part:@sanity/base/schema-creator'

// Then import schema types from any plugins that might expose them
import schemaTypes from 'all:part:@sanity/base/schema-type'

// Then we give our schema to the builder and provide the result to Sanity
export default createSchema({
  name: 'default',
  types: schemaTypes.concat([
    film
  ])
})