In the Shinobi world,you will also gain money,wether it be through stealing,gaining money in a job(you can be a ninja and also work as medic,teaher,shopkeep or anythign else)or through mission. The money you gain can be spend on Items. You can also use the money to get costum items,which are much more expensive but more powerfull.
The shops vary form village to village. A shop in Suna might have puppets while the shop in Konoha has not.
However first a list of what exists.
Common Ninja tools:
Shuriken
Kunai
Senbon
Empty normal scrolls
Ink
Brush
Wire
Rope
First aid kid
Map
Compas
Smoke bomb
advanced Equipement:
Sealing Scrools
Storage scrolls
Weapon scrolls
Big empty scrolls
Puppets(price varies depending on the amount of weapons within)
Poision(price varies depending on the poison/toxin)
Medical tools(scapell and so on)
Costum weapons
Food
Drink
clothes
Backpack?
Tent
Armor(not too heavy you are no samurai!)