I have had a look at the example 3D side scroller that is included within Unreal Engine 4 (4.9.2); and the first thing I think I need to change a lot compared to this example is how the camera is used. Within the example, the camera is very static and it feels like that it is too close to the character, making it hard to see the environment around, especially when jumping. So one of my major goals over the next few weeks is to learn and create a camera system that is less static to the character, is able to move back and forth, and also able to rotate pointing towards the character.
With the character movements within the example, I feel that what is given is a great start for what I want to produce in my final version of the game, all I will need to change is how quickly the character can move and maybe try to add a double jump mechanic within the game.
Finally, after looking at what I be working with, I think that it will take a few weeks or maybe just over a month to get a very basic version of the first introduction level (which will be teaching the user how to move the character around). I feel once I have made this though, the production of the levels will be developed a lot faster.