A simple example (just layout) to write javascript appium test case? iOS platform

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I am trying to find a simple structure to write a appium test. Just a layout for now.
So far I have got my desired capability set and a client (as below) running.
A link to simple suitable doc reference or example would be appreciable.

my file for ref:

// javascript
const wdio = require('webdriverio');

const opts = {
    port: 4723,
    desiredCapabilities: {
    platformName: "iOS",
    platformVersion: "11.2",
    deviceName: "iPad Pro (9.7-inch)",
    app: "/Users//Library/Developer/Xcode/DerivedData/gxvxdqhgagczfggrmvvrxckjtlaw/Build/Products/Debug-iphonesimulator/Test.app",
    automationName: "XCUITest"
  }
};
const client = wdio.remote(opts);

  describe ("login page", () => {
  it('should be able to login', () => {

  	 --  ????(how to find an element and do i need to use .wait())	

  });
});