Once you have refitted your Turbo and reconnected all hoses and filters you need to check a few things:

Check the oil level - this will certainly need topping up. Bear in mind that you will need to replace the oil and filter within 500 miles.

Ensure your coolant and all other fluids are topped off to ensure they will not cause any problems in general operation.

Run the motor

Pay close attention to coolant levels and any warning on the instrument cluster

There may still be oil in the exhaust system, this will start to burn as the vehicle warms up.

If you notice smoke immediately (from a cold engine) stop the motor immediately and check all your connections. This could be an indication that oil is getting burnt in the turbo.

If all looks ok and the car is brought up to temperature, while idling, gently increase the revs up and down over the course of a few minutes - shut down and check for leaks. You are done!