There are about 40-50 sheets in a pack. You'd rarely want to eat more than 4-5 of them in one sitting (these are starters not enders or this-is-all-you'll-getters). There are tonnes of variations to this dish and I am simply going to tell you the tale of tonight's dinner.
Once you have that placed on the rice paper, you should add a few leaves of fresh basil. Fresh basil in Bangalore is available in the Food Gourmet store on M. G Road and I think in Maison Des Gourmets (Lavelle Road). You might find it at other places. In Madras you will find it in MDG (Senatoph Road) and in the American Vegetable Store in T Nagar. No, you cannot use dried basil for this. Please don't. Have a heart!!
Now, you need to carefully roll the paper (it is still delicate) making a nice translucent pouch containing all the ingredients mentioned above.
What are the variations possible? Several! I would need a few hundred posts to outline all of them. Experiment with different vegetables (I would never recommend non-veg in this lifetime), different sauces, tofu, paneer, feta cheese, groundnut powder, gunpowder (something that you will get in Maharashtra) and so on. I have played around with several combinations including sun-dried tomatoes, harissa, soya sauce, etc. Be creative! That is really what cooking is all about, and of course the joy of feeding someone.