I usually aim for 1 hour before sunrise.
You might like to practice sunsets first.
Much more forgiving and relaxing as you are getting set up in the light.
With sunrises you are doing your setup in the dark by torchlight.
Your best shots will be taken with the sun below the horizon and make sure you keep your eye on the opposite side of the sky.
You get some remarkable surprises behind you. 5% of the time that is where the best sky is.
The real secret to sunrise/sunset photography is, that, on its own, the sky is very rarely enough to make a good photo.
It makes a pretty picture and that is about it.
For a sunrise/sunset photo to be any good, to have any substance, it has to have a foreground or subject strong enough to stand on its own. The sunset/sunrise is the icing on the cake, the backdrop, that tops the image off.
(Generally speaking - there is always that exceptional image that proves me wrong)

I usually aim for 1 hour before sunrise.
You might like to practice sunsets first.
Much more forgiving and relaxing as you are getting set up in the light.
With sunrises you are doing your setup in the dark by torchlight.
Your best shots will be taken with the sun below the horizon and make sure you keep your eye on the opposite side of the sky.
You get some remarkable surprises behind you. 5% of the time that is where the best sky is.
The real secret to sunrise/sunset photography is, that, on its own, the sky is very rarely enough to make a good photo.
It makes a pretty picture and that is about it.
For a sunrise/sunset photo to be any good, to have any substance, it has to have a foreground or subject strong enough to stand on its own. The sunset/sunrise is the icing on the cake, the backdrop, that tops the image off.
(Generally speaking - there is always that exceptional image that proves me wrong)