It all depends on how do you want to explore it.
here are the options:
1. Bike from Delhi/Manali to Leh
2. Rent a Bike in Leh
3. Explore in a four wheeler if not interested with Bike.
Must Visits :
1.Day1: Leh to Kargil Via Magnet Hill on day 1 as it gonna be a good start just after acclimitazation.
2. Day2 : leh to Nubra Valley Via Kardungla Pass
3. Day3 : explore Nubra
4. Day4 : Nubra to Pangong
5. Day5 : Explore Pangong
6. Day6 : Pangon to Leh via Changla Pass
7. Day7 : Explore Leh Market and Monestries.
If you still have time, explore more like Rancho school and Army museum along with flag down event in the evening.
Hope this helps..
Go with bus till Manali and take bike from Manali on rent ND then continue your trip then u feel the real view of laddakh ND budget is depend on person to person according to need but it approx 8k to 10k if u r two persons