Here is a list of some essential spices for our members who are new to home cooking:
Kashmiri Chilli Powder
Tej Patta if not then Bay leaves (but they are not the same)
Green Cardamom Pods
Black Cardamon Pods
You can make home made Garam masala using spices from the above list.
Kalonji / onion seeds
Crushed chilli flakes
There are other spices too but you can build them slowly otherwise this list would go on forever.