Alright, let's get started by installing the Firebase CLI. Just pop open your terminal and run this command:

```shell
npm install -g firebase-tools

Next up, we need to initialize Firebase in your project. Head over to your project directory and type in:

firebase init

When prompted, choose to set up 'Functions' and 'Firestore'. Pick JavaScript or TypeScript based on what your project needs.

After initializing, you'll see a "functions" directory with a bunch of files. The main one you'll be working with is "index.js" (or "index.ts" if you're using TypeScript). This is where you'll write your Firestore Triggers.

Firebase Firestore triggers are pretty cool. They work with Firebase Cloud Functions, which are serverless functions that respond to Firestore events like onCreate, onUpdate, and onDelete.

Here's a quick example of setting up an onCreate trigger:

exports.onDataCreate = functions.firestore
    .document('collection/{docId}')
    .onCreate((snap, context) => {
      const newValue = snap.data();
      console.log('Data Created with', newValue);
    });

Just replace 'collection' with your specific collection name. 'docId' is a wildcard that stands for the id of the document created.

Once you've got your cloud functions written, it's time to deploy them to Firebase.

In your terminal, while still in your project directory, run:

firebase deploy --only functions

This will deploy all your cloud functions to Firebase. It might take a few minutes, so grab a coffee or something while you wait.

After deploying, you can test your function by triggering the event it's waiting for.

For our example, this means creating a new document in the specified collection. You can do this manually using the Firebase console or trigger it within your application.

To check if your trigger works correctly and to debug any issues, head over to the Firebase console's 'Functions > Logs' section.

Remember, Firestore triggers run on the server side, so they won't directly affect your client-side code unless you've set up a real-time listener for your Firestore data.
```