First, you'd need an idea for the channel. What is it about? What valuable services or knowledge can you offer? Once you've decided that, you'll want equipment. Most YouTubers recommend buying cheap equipment, and only upgrading if the channel takes off.
A full-time job will tire you out, but set milestones for each week, even if they're only small. Write half a script, or brainstorm ideas, for example. Best of luck!