Set in the not so distant future we find a habitable planet very much like our own. The only downside is that it's around 500 years of travel with our current technological capabilities.

We have to assume a few things in this hypothetical scenario:

• We have the means to send around 500 humans to the planet.
• All humans survive the journey (Think cryogenic sleep).
• Only a single ship can be sent out. All the necessary people and materials should be on this ship. The colony will not be able to be supplied with additional colonists or materials.

what are the top priorities once landed in order to create a self sustaining colony?