How and where do i start making the environment for a cinematic clip?

I need to create an environment of some land and sky for a short cinematic clip. What tools are available within UE4 if any, or do i need to go to some external program to do this? I want to create a cinematic clip of a hot air balloon rising up in the atmosphere. Also are there any tutorials available for this?

Thanks.

If you just need a simple, flat terrain with some grass, and a blue sky, you could learn all you need from this tutorial and ignore the parts about building the house: https://docs.unrealengine.com/latest/INT/Engine/QuickStart/index.html

If you’re looking for a more realistic terrain with hills and stuff, you can use the Landscape Tool: https://docs.unrealengine.com/latest/INT/Engine/Landscape/Creation/

the landscape tools are terrible for making realistic landscapes, vue / world machine / or real world elevation height maps are the way to go