Assuming you have a domain and hosting.
You are unable to pay a content writer, so invest you own time into a blog that is of interest to yourself or at least prepare to do some extensive research.
After you have done your initial keyword research, check the quality of the content from your competition on google, is Wikipedia ranking first? Who cares, who can be bothered to read there content anyway.
Create content that blows your competition out of the water, not by writing a 3000 word article but by creating a page that is valuable to your potential readers, include pictures, include demonstrations, leave your readers thinking wow, entice discussions, create content where people in your niche see your content as the best, the most educational, where people will reference your pages in a discussion.
Spend a week coming up with an amazing piece of content and repeat each week.
Content is still king and they make it clearer with each update.