I'd personally suggest you to first decide on whether you plan on driving down to Ladakh or taking a flight. Next up, decide on the places you want to cover and where you want to actually book an accommodation. Since Ladakh is an extremely remote place, a trip to the region can often end up being big on the pocket. Therefore, planning a per person budget also makes for one of the essentials. Here are a couple of trips that will help you with all the information needed before heading to Ladakh and planning your dream getaway: https://www.tripoto.com/trip/the-dream-trip-leh-ladakh-59ae19b13e2aehttps://www.tripoto.com/trip/things-to-do-in-leh-ladakh-tourism-itinerary Hope you have a great trip! :)
Ladakh is best holiday destination ever. So i would suggest you to plan out clearly so that you don't miss out any places or chaos your trip. You can take help of any travel companies. https://www.funstay.in/ladakh-tour-packages I think this link can help you guys. Second thing is you should decide how you will reach Ladakh? You can take land route or you can go by flight. Do not miss out to take the best camera because Ladakh is filled with beautiful scenery. So you can come back with tons of memories.
Carry sufficient amount of water.
As Ladakh is at highest elevation, it is 18875 ft from sea level. Oxygen levels will be low at this height. Make sure that you have no health issues.
Always better to carry a detailed itinerary along with you so that you will know which place you will be going and it also helps in better understanding of your trip.