Quick question about creating my own content

You’re going to have to spend a while learning 3D and working with UE4 before you can try to do something like that. You don’t see games that do that type of thing because it’s a technical problem, but you’re way far off from even trying to do that anyways.

Blender is a perfectly good piece of software for you to start working with. It’s free, and you can definitely do what you need to with it to be able to make things for UE4. Also, if you are a student you can get a student license of 3ds Max and Maya for free which are similar types of software but are the programs that most game studios use when developing games.