Hi
I’m new to all this with developing games and I’ve only got one question: Where should I start? 
Thank you for your answer. 
Online tutorials from Lynda.com , digitaltutors.com will help you get a solid understanding of the software.Also start making projects,nothing beats the experience.
You really shouldn’t spend money when there are plenty of official unreal engine tutorials out there that give a lot of information. Just use the official tutorials to start out. Once you become decently able with UE, then you should start to consider those sites.