Hi Xpoptart X, the advice I've heard the most from other artist is to master the fundamentals by learning to deconstruct anything you see into their basic forms and reconstruct them again. If you can learn to do that, you should be able to draw anything from your imagination.
But honestly, its good to use reference for what you want to draw. As artist we're attempting to imitiate reality in our art, so having something we can reference helps us achieve that. Plus all that the great artist I follow use reference when creating their art.
I hope this helps you!
