Given the rule "If I can understand it then I can do it" - which I feel needs some expansion - then the obvious first goal should be to increase your methods of improving your understanding. Ultimately you're going to want to get as close to omniscience as you can reach, which will give you the maximum amount of possible actions.
From one of your comments:
If I used the aerospace knowledge that having more air pass under me than over me would create lift, I could fly.
This implies that any effect that you know the mechanism of - generation of aerodynamic lift in this case - can be produced directly without having to mess about with the actual mechanics of lift. You understand how wings generate lift so you can generate lift without in fact having wings.
This seems to be contradicted a bit later in the same comment (regarding Gravity):
If I knew of spacetime warping, I then had the knowledge to affect gravity by affecting change in spacetime?
This implies that in order to alter the force of gravity you have to go all the way down to affecting the (to the best of our knowledge) fundamental cause of gravity. You can't magically generate gravity but you can bend spacetime to your whim.
Let's say you understand Newton's Law of Universal Gravitation. You know that there is a force called Gravity that acts between particles with mass, you understand the formulae and so on. But your understanding is based on a flawed model. Actually gravity is a fictitious force that is due to motion through curved spacetime. Or it might be a quantum field effect. Or the interaction of mass with some unknown field. Or any of a number of other things. How would you progress from your understanding of Newtonian Gravity to Relativity?
Unfortunately this is going to be a big problem. Before being exposed to Einstein there were very few people who ever even considered empty space to be a thing that could bend, let alone time being part of it. There are people today who don't believe that time is dimensional who think that Relativity is a handy model but isn't actually true. If you have to understand what is actually, really true about how the universe functions then you might never be able to do much without revelation.
But maybe it's enough to have confidence in your understanding. You've figured out that you can do magic, but your brain is trained in logic and reason and won't let you just accept the situation. It demands that there be reasons and limits and so on, because otherwise the universe can't possibly make sense. So when you try to lift a rock with your understanding of physics, using your understanding of warped spacetime for example, what you're actually doing is simply justifying your ability to make the rock move. Actually you're just moving the rock by force of will. If you didn't believe that you could because you don't understand enough about the physics then, sadly, the rock remains unmoved.
It would be kind of sad if you spent decades trying to understand things only to discover that you just have to want it to happen and it does, huh?