Welcome to the forum 
So you’re interested in Roman magick?
I had to look that chap up… Orcus was a god of the underworld, the personification of oaths and punisher of broken oaths. Interesting! I would then expect if you haven’t broken any oaths you don’t have to worry.
Eh, this is called "Unverified Personal Gnosis aka UPG. Unless its independntly verified by ideally yourself and another person, or signs and omens, or you read the cards for certification, what other people say is not worth very much. The impulse is probably good; the interpretation, highly subjective. Best taken with a pinch of salt and we’d encourage you to look into it before making up your mind.
Of course one way to look into it is to contact the entity and ask them.
So on that note, and given you’re new to this, here is a getting started with magick guide. You’ll want to get your spiritual hygiene sorted out, and start work on developing your astral senses, then when you can know you have a decent chance at avoiding impostors and parasites then try the evocation guides we have on here.