Hello Arpit ,I will be happy to answer your travel queries ☺️.
*Alright,you can start your plan from shimla [reach shimla from Delhi by air or by road ]then move to kullu * explore the place fully then move to manali ,stay here , enjoy mall road and then move to Dalhousie .do stay at any isolated luxury resort there ,this place is just magical .
*Then travel to chamba ,satisfy your soul with amazing hills ,even explore dharamshala and marikaran if you have a little more duration .
*then get back to Delhi and then back to your place .
*if you haven't booked yet ,I have a small suggestion for you ,I just checked and found that there are some great deals for himachal-pradesh available at tripoto itself ,please go through this https://www.tripoto.com/himachal-pradesh/tour-packages HAPPY TRAVELLING ☺️😊☺️