I feel people should study Kapital at some point but I'd rather start with easier texts to get a general picture of MLism and then tackle Kapital. The reason is that the pamphlets are texts intended for the masses not accustomed to Marxism while Kapital is academic in nature.

That said, these are my personal beliefs and there is no single path to tread. As long as comrades are radicalised and educated, I am happy. :^)

There's nothing wrong about starting with Das Kapital. But most who are just learning about Marxism-Leninism will consider it too difficult and too hard to understand probably — I read the first 4 chapters of Das Kapital so far (then I had to delay further reading because I no longer had the time or energy, I should continue somewhen), and I had to really study it like some people study math, i. e. write out all the important information in points, draw some scheme to visualize it, etc., so not exactly an easy book to start with. I started with Imperialism As The Highest Stage Of Capitalism, it was much easier and still addressed important aspects.