Go to your Automations and click on Create Flow Button:

Add a Send Email step: 

Now, add a Wait For Email/SMS Click/Open step in your flow:

You can select here that for what conditions will this step waits for:

You can add steps here that the condition will monitor: 

Note: You will use  Send Email and opened step if you want to wait for the opening of the Email and use Send Email and Clicked step if you want to wait for the clicking of Email.

You can also setTimeout for your Wait step: 

You can add more steps after the Wait step according to your requirements: 

And your Wait Step is Ready to Go!