SeanFace101
I Love YTtalk
In the field for "Channel Keywords" on the Advanced Settings page.. Do I separate each keyword / keyphrase with a comma? and how many should be added here?
I'll disagree with @Loki Doki a little here. My strategy is add about 20% genre keywords, such as toy, toys, kids, kid friendly, kids youtube, etc. The remaining 80% are medium to longtails that you are trying to rank for.
I completely fill the 500 characters available.
The important thing is to then incorporate all you tags in the description. I recommend 3 solid paragraphs with natural sentences using as many of your tags and variations as possible.
In the early stages of the video's life, and for low channel authority, the primary ranking mechanism for search and suggested is tags and description.