I would recommend you not get one - at least not yet.
You are actively seeking(profile) - any humiliation tattoo really is the last say of your dominant. If you were more interested in open relationships it wouldnt really matter, but youre making a choice and thinking about something that will affect any future relationship.
You could try permenant markers first. Having someone scribble 'whore' or some similar wording in a place that you will see daily. These last a couple of weeks, depending on the marker and will let you have a taste.
As you do not want the image visable to the public, I am not really sure if it is humilation you seek, or rather a visable reminder on who you are and where you belong - that is just my take on such a thought anyway. So in that case, I would say, give yourself some more time to work out where you are and what your place is in BDSM before you starting thinking about such gestures - especially when you say you have no realtime experience as yet.
Peace