Shingling over is the easiest thing to do, you wouldn't use tar paper or ice barrier. Instructions are on the package of shingles. Nice thing is you can be relaxed on time. It is recommended that you replace any missing tabs first.
You will have to remove the existing ridge row. I prefer the rolls of low profile shingle over ridge vent unless you have existing metal to reuse. I had some of the taller stuff that came in 4' lengths and it has a foam filter to keep bugs etc. out and after 10 years the filter was rotten, yep had to replace a 10 yo roof last summer. Not cheap at about $2.25/ft.
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