It will take some time to make it a reality.But let me give up the blueprint for it.
The technology to make this happen is available now for sure.
Nano tech and 3-D printing.
1. Design and build a nano space engine
2. Use the 3-D printing system to create the model for the ship,then use it to create the actual parts for the ship.
3. Use the 3-D printing system to create the structures needed on a planet where the ship or ships will finally set down to create a new place to live besides earth