How to act when you time travel

Draco Malfoy finds himself back in third year with his memories that are now his future. What will he do? Will he change his fate and help others along the way? What will happen to Sirius black. Will his godfather Severus Snape help him?

How will his relationship be with the golden trio? Will he cause problems still? what will happen to everyone else? Will they be affected negatively?

Draco time travels and at first he's back in his third year. How long will he stay there? Will he ever be able to get back or will he be stuck?