Start basic and gradually improve (your setup, your tools, your editing, your closed captions or transcriptions, your video descriptions, your promotion, etc.)
Upload as much as possible. Be consistent. Find out what works for you.
Find the formula that works for you. If it’s a hassle, you’re not going to last.
Ad revenue (AdSense), sponsors, affiliate commissions, promote your own products or services.
DIY vs Outsource Something
You can do all by yourself or outsource.
There are plenty of tools (from free to paid).