Need to animate long fly

Hi there!
I am novice so sorry for stupid question.

I have an idea to make long fly near the earth (about 5 seconds or 7 ) and after that stop near one point. And that’s all…

So I have to big troubles. First of all, This is a horizon. How should I do the earth? If I use plane it will be very large… And I the horizon is not so good… I have clearly view that there is a plane… :frowning:

And the second – how should I work with so big plane?
Does Anybody have advice for me?