Not an ancient guy. Need help identifying roman coin

I got this coin the other day. It's from on of the Constantines but that's about as far as I can get.
Any help on what it is and if it's even real?
It's 16mm to 17mm and weighs 1.6G.



Any advice would be appreciated.
Also if I get more into ancients what are the best resources out there for learning about and identifying them?

 

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I have good news and bad news. The good news is that Constantinian-era coins are common and can be found cheaply. The bad news is that your coin is a well known fantasy (a reverse that never existed for Constantine) fake. I don’t have a link on hand to prove it but I’m confident yours is not authentic. But! Don’t let that discourage you. There are tons of perfectly authentic ancients out there available at modest sums. Check out Vcoins.