Take bus from esplanade junction , the bus will reach silguri junction. then silguri junction you can take taxi up to Darjeeling .taxi fare is around 150-200 per person. 10k each would be sufficient
Hey Arijit, A road trip to North East is cool. Tripoto offers awesome packages for Darjeeling & Gangtok. Attached with my comment are few options. Please take a look, fill the form and someone will get in touch with you.