Affiliate Marketing Secrets

My idea for a niche is in the point of a teen writer. It covers all aspects of writing (types of writing, publishing, etc) as well as tips for writing well. It also covers book reviews and interviews of YA authors who were published as teens. My idea covers the aspects of being a teen and coping with writing and high school at the same time. The main niche over all is being a teen writer.
And, of course, other teen writers are my targeted audience.
Is it okay or is too general? Should I narrow it down?
Thanks in advance!