The common materials include rice flour, barley flour (Jau), black sesame seeds (kala til), Kusha grass (sacred grass), honey, milk, ghee, flowers, fruits, betel leaves/nuts, incense, lamp, water pot, white thread, and specific leaves like Tulsi.
You need not worry about bringing these from afar. All necessary Puja Samagri is readily available in shops near the Ghats and temples in Varanasi. Often, the Pandit you engage will arrange for the required materials as part of their service.