Hey Nishant I would recommend you to take a trip with some agency as the roads are treacherous. Check this out https://www.tripoto.com/tour-packages/manali-tso-moriri-ads
It has the route as well in case you decide to venture on your own.
Hi Nishant, the most popular route is Delhi-Chandigarh-Manali-Leh. The road passes through Rohtang Pass, Keylong, Jispa and Sarchu. You can spend the first night in Manali, second in Jispa and reach Leh on the third day. The other slightly longer route is Delhi-Chandigarh-Jammu-Srinagar-Leh. On this route you can spend the first night Jammu followed by a night in Kargil before reaching Leh on the third day. You can also book an organised bike tour that covers the best of Ladakh - https://www.tripoto.com/tour-packages/delhi-manali-leh-ladakh-on-bike.
Dear Nishant, I can guide you from Leh to Manali. Just go through this and make your own Itinerary. (i) Leh
1. Hall of Fame Museum 2. Namgyal Tsemo Monastery 3. Leh Palace 4. Zorawar Fort 5. Shanti Stupa ( Buddhist temple ) 6. Shey Palace ( Monastery ) 7. Thiksey ( Monastery ) 8. Hemis Gompa 9. Magnetic Hill 10. Gurudwara Pathar Sahib 11. Khardung La (ii) Nubra Valley
1. Diskit Gompa 2. Hunder Sand Dunes with Camel Safari 3. Turtuk Village 4. Tiger Camp 5. Charasa 6. Ensa Monastery (Gompa) 7. Yarab Tso Lake 8. Panamik Hot Spring (iii) Pangong Lake (iv) Changthang
1. Chushul 2. Hanle with Indian Astronomical Observatory 3. Tso Moriri Lake with wildlife 4. Puga Valley 5. Tso Kar Lake 6. Yaye Tso 7. Chumathang Hot Spring 8. Kiyari war memorial (v) Aryan Valley (vi) Leh to Kargil
1. Nimu village 2. Likir, Alchi, Lamayuru Monastery 3. Fotu La, Namika La 4. Mulbekh Monastery (vii) Suru Valley
1. Parkachik Glacier 2. Nun Kun mountain 3. Rangdum (viii) Zanskar Valley
1. Padum 2. Phuktal Gompa 3. Chadar Trek (ix) Hemis National Park
1. Stok kangri 2. National Park but Main Focus SNOW LEOPARD (x) Leh - Manali Road Trip
*** Leh --> Shey --> Thiksey --> Karu --> Upshi --> Rumtse --> Taglang La --> Debring --> More plains --> Pang --> Lachalung La --> Sarchu --> Suraj Tal --> Baralacha La --> Zing Zing Bar --> Darcha --> Jispa --> Kyelang --> Gondhla --> Khoksar --> Rohtang La --> Kothi --> Manali