RomanArmyTalk

Good evening all! 
I've been looking into Roman reenactment for a while now having done 6 years of Vikings. I've just started getting kit together, and I've been offered the following helm and lorica segmentata by a mate. Having very little knowledge of the period, I've no idea if these are suitable, authentic props or 'interpretations' that I'll have to replace. 
Thanks in advance!

No. That's the infamous trooper helmet and it's not acceptable for reenactment.

The segmentata is bad too and I strongly recommend avoiding a Segmentata altogether unless it's custom fitted. I'm assuming you're a woman based on the name so it would probably be a very bad fit on you since these things are usually sized for... bulky guys, to put it bluntly... and as a result it will destroy your armpits and shoulders if you wear it.

Check out the Legio XX Guide. Bit dated, but still a good start:

http://www.larp.com/legioxx/hndbk.html