Extreme amounts of planning and redundancies for every system and contingency.
Unless your ship is truly massive you will already be growing food aboard your ship. Even the weight of cryogenicially food would require tons of extra fuel. Your ship would still have to stop from time to time to harvest minerals from space in generally. To provide for repair and supply of the ship.
The ship would also need an many 3d printers and/or star trek replicators even if only to make parts for the ship. Given the many generations involved maintenance and food would have to be a top priority.
You would need to have the ship assisted pregnancy tech(think quadruplets all the time) in order to have the most amount of children in the least amount of time.
Extremely advanced teaching machines capable of implanting memories and/or abilities in months instead of 18-25 years common today. Each person will have to learn several disciplines, if not all, for redundancy.
Advanced maturing tech to help them become physically fit for duty, whatever age that might be. Initially probably 10 or 12 yrs old, maybe less for trivial duties, mop the floor if that is even required.
Eventually as they got close to the planet the ship and people would have to prepare by roughing it more and more so they were ready for the planets surface. More and more automatic systems would have to shut off so the people would learn to do it themselves. This would also help prepare them for the ship being damaged. The last 3 or 4 generation would have to be all about contingency planning and prep.
If you want enough people your ship will start experiencing over population for the size of the ship in the last few generations. Including structures/housing they can eject from the ship before it crashes so it survives basically intact.
So now they have near the planet, and for whatever reason we are about to crash land. The ship is on the ground, presumably holes in the hull, and advanced systems would have to be damaged. In all likelihood the crew of the ship would probably choose not to use it especially,weapons,shields, and engines which would use tons of fuel. The fuel it takes to power the ship for a year could probably off shelter and basic tech for a decade or more. In addition, rare elements which are common in outer space probably won't be readily available on our planet for years/decades.
Having prepared and trained for this thoroughly, they would initiate the plan. Walls and defenses of some kind would be constructed immediately even if the walls were wood and/or stone and bows and arrows. They would have to begin farming within days. Hopefully you ejected some farming equipment/supplies in crash proof containers before you crashed, or you will have to manually plow the ground and plant seeds from a store house or your greenhouse depending how your getting food now.
As your population and need for food increases so does the land you need and the chances you will get noticed by natives/aliens. (worst case)Your highly skilled crew will have to start genetically modifying the plants so you have food that is non toxic to you and grows on the surface.
The whole area will have to be surveyed to find suitable areas for farming, production, defense, and all the other things a society needs. They will need to mark out and area many times what they need for future expansion.
Like others have said basic devices like tri-corders and smartphones/tablets would be indeed be handy for surveying without being noticed. Also they could aid in learning the natives language(s) if their is any intelligent life. It would be best to covertly fly in drones, and drop out listening devices to aid in learning the language and the government political structure. Then you know who you will be able to ally with, and who needs to be wiped out.
This is where playing generation of virtual war games on the ship will be handy so you are ready to defend yourself. Have enough defense, but not so much as to take over your economy and resources.
If your advanced learning machines stop working, you will have to have already planned for that as it will take years to learn a single skill.
Once the crops are growing in the native soil and you have shelter you biggest problem would probably be the natives. They probably number in the 100,000's of thousands and could probably wipe you out in an all out attack.
A lot of this is contingent on having scanned the surface and crash landed near land suitable for farming and water. Also hopefully an isolated area with minimum natives to worry about.
Then you need to advance yourself by building equipment to start mining. Then factories, production plants, and so forth as so on until you have a thriving culture. Each stage will take years, but eventually you will get there.