It all depends exactly what you have. What are they specifically made for? For example I have 12" red neon lights with no connector on them, I know that I can use them though because they are for a car i.e. 12v. I can't give you advice on how to use yours as I don't know what they are made for, their voltage requirements, or what type of plug attached if there is one at all. Mine don't have a plug, but being they are 12v I can attach them to a fan connector and use a fan power socket. but like I said, not knowing anything about yours I can't say what you should do.
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