Searching for targeting and ig shoutouts

[Big Chief]

I have a shopify store and my niche is geeky merchandise. Tv, gaming, comic related items.
I have items from shows like breaking bad, games like assassins creed, well you get the idea.
What age group should I target? What keywords? Also, looking to buy shoutouts but I just don't know how to call my niche... What pages are related to mine? And hour or where do I look for them?

Thanks.

 

[Big Chief]

Can someone please help?

 

[KatyCakes]

Geeky items would do the best in the tech niche, no? Computers, inventions, iphones... stuff like that?

 

[Big Chief]

Geeky items would do the best in the tech niche, no? Computers, inventions, iphones... stuff like that?

Yeah that sounds about right thanks for your comment but I had a few more questions