
Don't expect to get a big number of money at first even if you are selling or promoting big things or important services according with their values. You can be probably lied by Google about where and how much time the ads ar being shoed and you can always find people with adblocker active in there browsers even in YouTube. I do have them active and I am successfuly running Youtube. You may be winning some money in time recovering you ads investment by that's another story. Having a good SEO competes with Google ads and it's most probably winning (I can't be sure without runing ads).
Until learning SEO you have a Google ads tutorial in previous video.