Inder is very good when it comes to maintenance and will also give you a riding lesson in case you want one. You can start up from Karol bagh or wherever you stay and move out of the city in the AM. The highway out of
Delhi is pretty decent and you'll find all your needed being catered too.
There are two ways to reach manali :
via chandigarh (short and faster) and via shimla (long and slow)
You'll reach the city of Chandigarh in 4 hours max and then you'll have to wade through the city traffic. There are enough roads signs in the city that point out the way to Manali. You can reach manali easily in 12-14 hours.
If you want to go via Shimla then keep an extra day at hand.
From Manali there is only one road to Leh and you can't miss it. The trick to get past the first pass (Rohtang - 50kms) is to start up early and reach there in 2-3 hours rather than starting late and getting stuck in uphill traffic and wasting half a day. You will find accomodation in Marhi but then its not worth it. This day you should aim to reach Keylong if not more
Next day you'd probably stay in Pang and its here most probably that you will get hit by AMS so carry drink loads of water, avoid liqour and take some AMS medicine.
Next day you can ride from Pang to leh with ease.
There will be a TON of tent restaurant who also serve up as accomodation if required. Cheap and good way to spend a night.
Leh will be awesome (as it has been always) and you can find accomodation to suit any budget. I usually pamper myself with a good room in leh coz it becomes like a base for us to return to.
Secure your inner line permits for wherever you want to go.
Ride to khardungla and back to leh is hardly 3-4 hrs and then you have rest of the day off. You can ride to Pangong Tso which is a lot more difficult than others coz you pass one of the most difficult passes called Chang La.
That's enough from me................ for now