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  1. Don't overthink it, if you do (which is highly likely) take the best core concepts of your scope and try to make a simple playable game and focus on the polish (visuals included) once the game mechanics are waxed using basic privatives (cubes, spheres etc.). Make a minimum viable product - it has to be playable. Won't help if it's super beautiful but you can't play it.
  2. Write stuff down - you can always take some more of the inspiration from your bigger scope ideas to add game feature updates in the future. 
  3. The most important thing is to enjoy the journey!
  4. Unity Asset store and the other places that the legends in the forums suggest are good. Google is your friend too. Cross-reference and check reviews.