You can also try listing your website on guest blogging communities such as MyBlogGuest and BloggerLinkUp. They can help you to hook up with writers, authors and bloggers who are willing to contribute guest posts.
However, as a new website, try to be strict on the moderation on guest posts. A lot of guest authors or bloggers out there are submitting low quality 500 words article just to get a backlink from your website. If these articles or blog posts add little value to your users or readers, your blog will not appeal to the audience that you are trying to target. This may even affect your SEO efforts in the long term. Sites hosting a lot of low value content may be seen by Google as a content farm that site owners use to get links, thus devaluing the authority (and of course, rankings) of your website in the search results.