We talked this out pretty thoroughly in a Forum thread headed "Real Cloth Sails?" I moved it to p. 1 this morning; it should appear just a few down from this one.
Give some thought to whether you really want to put sails on this model - which, as I understand it, is your first sailing ship. The scale is mighty small; I've never used the technique I described in that thread on a scale smaller than 1/128. (I think it would work, but I suspect some variations would be necessary.)
The other problem is the big enemy of anybody attempting a model of a vessel like the Pamir: repetition. My model of the frigate Hancock (photos: http://gallery.drydockmodels.com/hancock ) has 18 sails (plus two royals furled to their yards and lashed inside the topmast shrouds, plus four sails in the small boats). It kept me busy for six years, the last two and a half on the rigging. (Admittedly I worked on it intermittently - I changed residences and jobs twice during that period - and it's a scratchbuilt model.) The Pamir would have (depending on how many of the staysails were depicted) somewhere in the neighborhood of 33 sails - many of them virtually identical to each other. Furthermore, the Hancock's top hamper is in many ways relatively simple; it's made almost entirely of wood, rope, and canvas. A latter-day sailing ship like the Pamir incorporated all sorts of mechanical gadgets (e.g., Jarvis brace winches and gin blocks) that hadn't been invented in the Hancock's day. Much of the Pamir's rigging was made of iron chain (almost impossible to represent convincingly on 1/200 scale), and ran through specialized blocks that would have to be made from scratch. I'm not sure I'd want to tackle that job.
My suggestion to newcomers is to start by setting up the standing rigging (shrouds, stays, backstays, martingale stays, and a few others) and the basic running rigging that supports and moves the yards: the halyards, lifts, and braces. Throw in the basic gear for the double spanker on the jigger mast: throat halyards, peak halyards, vangs, and boom sheets. At that point in the proceedings you'll have rigged a couple of hundred individual lines, and the model will represent, with reasonable accuracy, a vessel that's been sitting in harbor for some time, with her sails and their associated gear stowed below. Take a deep breath, imbibe some liquid refreshment, and contemplate at some length just how you want to spend your leisure time for the next several months to a year - and whether you really want to spend the money on the several hundred additional aftermarket blocks and other fittings it will take to represent the rest of the gear necessary to sail the ship. Most people find that - especially in the case of a huge, 4-masted barque on such a small scale - the lines I've just mentioned are plenty.
I hope this doesn't come across as snobbery or anything of that sort. But I've only seen half a dozen latter-day sailing ship models on small scales with reasonably complete running rigging including sail gear. Those models were built from scratch by people who are far better and more experienced than I am. One of Donald McNarry's books, for instance, includes photos of his model of the Herzogin Cecilie on, if I remember correctly, 1/32" = 1' scale. It has furled sails and remarkably complete running rigging (all made from wire). McNarry is a wizard; if I had to give anybody the title "world's best ship modeler" it would be him. But he acknowledges in the book that rigging those three nearly-identical masts, each with six square sails on it, came close to driving him up the wall.