1
Define the job
Name your audience, channel topic and intended feeling. Say whether the opening should identify the channel, set a mood or lead directly into the episode. That gives an AI-assisted workflow a more useful direction than a vague request for something cinematic.
2
Shape the look
Specify a few repeatable cues, such as a color palette, type style or recurring graphic. Keep your channel name easy to read, and avoid effects that compete with it. If you use a youtube intro maker, judge each visual choice by whether it supports recognition.
3
Review the opening
Watch the result at normal playback speed and on a phone-sized screen. Check the first second, the legibility of any text and the transition into your actual video. Revise the brief if the concept looks impressive but says little about your channel.