Reddit reviews Cooking with My Indian Mother-in-Law: Mastering the Art of Authentic Home Cooking

The trick is: don't just use curry powder. In my curries, I typically mix curry powder, garam masala, hot chili powder, tumeric powder, fresh garlic, ginger and chilies, and maybe some cardamom pods, dhana jiru, mustard seeds or coconut cream depending on the recipe. Anyways, you're probably better off getting a book and following a few recipes until you get the hang of it and start mixing your own stuff. I got this one but it was about a tenner back in the days so you should probably get something else.

Edit: KRK on woodlands road is a really great suggestion