I will be completely relying on SEO for traffic.It's not bad, but there is a problem with brand building and stuff with domain such as that, but if you are going for a pure traffic from seo you can do it
I personally would not use such a domain
I am creating my first niche website, found a .net domain with 2400 direct monthly searches and good CPC. However, the domain is lengthy with 21 letters (three words), is it ok to create niche site with such lengthy domain.