There are museum collections with significant numbers of South Asian weapons (and other objects), which you can search. Three that might be very useful to start with are

1. The Royal Armouries: https://collections.royalarmouries.org/ (Filter -> Place -> India might be useful)

2. The Metropolitan Museum of Art: https://www.metmuseum.org/ (Searching for "India spear", "India sword", etc. will find useful things)

3. The British Museum: http://www.britishmuseum.org/research/collection_online/search.aspx

Some weapons which you might like are the katar:

• https://collections.royalarmouries.org/object/rac-object-1904.html

• https://collections.royalarmouries.org/object/rac-object-31535.html

Fairly conventional swords:

• Shamshir: https://collections.royalarmouries.org/object/rac-object-27152.html

• Tulwar: https://collections.royalarmouries.org/object/rac-object-1739.html

• Tulwar: https://collections.royalarmouries.org/object/rac-object-1733.html

and some more exotic swords:

• Khanda: https://collections.royalarmouries.org/object/rac-object-1727.html

• https://collections.royalarmouries.org/object/rac-object-22186.html

• Two-handed sword: http://www.britishmuseum.org/research/collection_online/collection_object_details.aspx?objectId=572983&partId=1

Other conventional weapons such as

• Bow: https://collections.royalarmouries.org/object/rac-object-54178.html

• Spears: plenty to be found in both the Met Museum and the British Museum

• Mace: https://collections.royalarmouries.org/object/rac-object-22181.html

and exotic weapons such as:

• Combination matchlock gun and axe: https://collections.royalarmouries.org/object/rac-object-1910.html

• Saintie parrying spear: https://collections.royalarmouries.org/object/rac-object-37290.html

• Elephant sword: https://www.metmuseum.org/art/collection/search/679021

• Boomerang (valari): http://www.britishmuseum.org/research/collection_online/collection_object_details.aspx?objectId=573811&partId=1

Two old books that might be useful, being available, at least in part, online, are

• Stone's Glossary: https://books.google.com/books?id=chVfUm2Hz3MC (see the entry for "Zaghnal" for a nice weapon)

• Egerton: https://books.google.com/books?id=52FDeFdxbV0C

An excellent newer book to read, if it happens to be available in a nearby library, is Robert Elgood, Hindu Arms and Ritual: Arms and Armour from India 1400-1865, Eburon, 2004 (and any of Elgood's other books on Indian arms and armour).

Hard to find, but good, is Philip S. Rawson, The Indian Sword; printed a few times by a few publishers - any of the editions will be good.

Hi - we as mods have approved this thread, because while this is a homework question, it is asking for clarification or resources, rather than the answer itself, which is fine according to our rules. This policy is further explained in this Rules Roundtable thread and this META Thread.

As a result, we'd also like to remind potential answerers to follow our rules on homework - please make sure that your answers focus appropriately on clarifications and detailing the resources that OP could be using.

Additionally, while users may be able to help you out with specifics relating to your question, we also have plenty of information on /r/AskHistorians on how to find and understand good sources in general. For instance, please check out our six-part series, "Finding and Understanding Sources", which has a wealth of information that may be useful for finding and understanding information for your essay.