Think much much much smaller!
Try for a simple whack a mole kind of game first to get a handle on what mechanics you want.
And expand from there.
Also a noob in Dev but have previous experience in leading a dev team and modding + modeling.
One of my biggest mistakes and a comon one is starting too large.
I recently started again at an attempt with Blender and UE4…
but this time it’s really mobile like small.
Go as simple and small as possible with first projects… even making a pong game would do.
Just to test your skills.
and than replace the physics, than add a donut onstead of the ball.
Go further and further.
Just start small.
Would be a waste to get stuck on a large project only to quit because you run into too many walls like i did at first.