Where did I start? I tried to make a game ( and did ). I just headed directly towards the functionality I wanted and figured out stuff along the way.
I think I threw away everything I did in the first year. Even things I was pleased with, because your skill level gets much higher.
I would definitely not learn about interfaces first, absolutely no point. There are subtleties here you just won’t get until later on, when you need them.
I’d recommend:
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Learn to make a basic scene. Can you make it look real?
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Make a blueprint ( door or gate or teleporter etc ).
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Learn about managing levels. How can you change levels?
If you do just those things, you will be a long way in the right direction.