@animeher - would be great if we know how long the ride would be. there are sufficient places to see / go to. Some Options I can think of:
1) Shortest duration - to and fro via manali, only K-top and Pangong Tso near Leh
2) Medium duration - onward thru manali and return via Srinagar / Jammu + Pangong, K-Top, Nubra Valley
3) long duration - throw in Spiti valley as well - go via shimla,reckong peo, nako, kaza and end up on the other side of rohtang pass + Pangong, Tso-Kar, Tso - Moriri, Nubra and K-top, return via srinagar.
Fix up the number of days, the details can be worked out
. As a thumb rule, around 400 km / day on good roads and 150-200 km /day on bad roads should be pretty relaxed.