http://www.jewishvirtuallibrary.org/jsource/Holocaust/uprising1.html
According to this source, the weapons initially used in the uprising consisted of "a handful of pistols, seventeen rifles, and Molotov cocktails" which were distributed among an estimated 750 resistance fighters. The weapons had either been hidden away before the occupation or had subsequently been smuggled into the Ghetto. It would most likely mean that the majority of weapons used early on were improvised with what was available - knives, farm implements, clubs, and stones. But, that is pure speculation on my part because of the lack of exact details.
My suggestion is this - if you and your girlfriend are serious about researching the Warsaw Ghetto uprising, go to the primary source material sources. There is a museum dedicated to this very subject in Warsaw and (at the risk of offending my peers) my best guess is that they are in a far better position to answer your questions than us armchair historians who are most interested in scale matters. An email or a phone call will probably point you towards the answers you need.