Installing parquet wood flooring

Hi there, I'll be installing parquet wood flooring soon. This is the kind where you use the glue and set the 12"x12" tiles. But first I am removing the old vinyl floor, about 15 years old. I think they are the kind that are self sticking. I've removed some of them with a scraper and heat gun. There is some residual tackiness left by the old adhesive. How important is it to remove this stuff...I really can't see it. If I need to remove it..how do I do it? Can I just paint over it with some sort of primer?
thanks in advance for your help
Mike
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One more thing I forgot to ask.....
I was thinking of giving the floor a light sanding and applying several coats of polyurethane so it would have a smooth finish. Would that be a bad idea?
thanks in advance.
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