Recently started learning little bit of SEO. Since I am newbie, thought about trying Micro Niche Site.

What I have learned so far is that Micro Niche sites are suppose to be easy to rank, with much less content than average sites.

What I want know is.

Does My Micro Niche Sites has to be EDM (Exact Domain Match with my Keywords) ?

I already have hosting and Three domain under my name, The only trouble is I don't have anymore money to buy exact Domain match.

So what can I do ?

Will creating sub-domain on my original domain help for ranking?

for example my keywords are "Paleo for old people" (Exact Domain Match = paleoforoldpeople.com )

Since I don't hava any money at the moment. What If I create Subdomian on my original Domian (supersizelife.com) like this --> Paleo-for-old-people-supersizelife.com

What I want to know is that, Is Exact Domain Match must for a Micro Niche Sites or Can I can make it up for it with Good content and few extra backlinks,
and other SEO stuff.