You just find out you are living in virtual world (simulation) and was grant permission to freely create matter. You can create anything, as long as you know it. The admin use you as test subject and see what happen if you have that such ability.
You have 2 ability:
Inspect the item: the item is near you, in your eyesight, or you can touch the item with your body part (no need eyesight now). Then the item property, material, schema, ... is written in your brain.
Create a item: create a carbon copy of what you inspect (copy a dollar bill), or you can create new stuff with your creativity (got to start somewhere, scan some basic material like sand, water, ... first then build with basic material)
So, what should you do ?
Others "thing", law of physics, people/biology behaviours as normal.
Corrupt politicians, corrupt law makers, and billionaires get a gram of francium magicked into the center of their brain.
All religious writing becomes saturated with an enzyme that dissolves the paper; hard drives with religious text saved to it become filled with the strongest magnetic material known, destroying their contents and shorting every circuit within; religious carvings are filled in with the missing material, etc. All of it, gone. Attempts to recreate get the francium. Attempts to spread it verbally get a few drops of water in the trachea.
Then it's straight to NASA to demonstrate the ability and put it to work doing things like manifesting materials in space and otherwise following the guidance of people much smarter than myself.
But part two states you can create carbon copies of anything you scan or create new things from your imagination. Part one states that touching things all the details of it within the simulation are encoded into your brain.
It serves to reason if you sampled a dozen different woods, you could manifest a wholly unique wood using your knowledge of how the other woods work within the system.
You don't even need to understand how they work in our reality, just how the simulation handles them. So if you can figure how the simulation codes the processor on your phone, you could then generate the highest possible specs in a processor and manifest it into your phone. The unwritten rule here has that you can instantly learn everything, the rest of the simulation is yours to bend.
The issue is the "your" imagination part. That is a huge limiting factor. Just because you can create a facsimile of something that functions does not mean you can derive hereto unimagined variations of them. You are assuming that the simulation bends to your will and reshapes itself to make what you want to be a reality, which is not in the prompt. Actually, the prompt quite specifically says that physics and biology remain unchanged by your attempts, so there is no just making shit up, it still has to adhere to the laws of nature and physics. Try to make a dinosaur now and it would suffocate in minutes because the O2 levels now are much lower than when they were alive. Attempt to make a cell phone that exceeds the fundamental quantum limits and it will burn out in an instant, or form a microscale black hole and destroy itself, jury is out on that one.