Well first of all, there is a thing called "speed control". This is when you use your judgement for how hard to hit the cue ball so it hits the object ball, then travels the exact correct distance to line you up for your next shot.
This is best to learn if you *always* use the same weight cue. If you are always using different weight cues, this will be difficult to judge. I use a 19.5 oz cue. (A heavier cue will be difficult to control for very slow shots.)
Then there is cue ball deflection. I have a low deflection Predator 314 shaft. With this, I can aim with a dead center aim, then move my front hand left/right (leaving my back hand in place) to apply english and the cue ball goes to the same spot as a dead center hit.
Then I use a dime shaped Moori Q (hard) tip and always keep it a dime shape using a dime shaped sandpaper shaper.
So basically I'm always playing with the same weight cue, same deflection shaft, and a tip with the same shape, hardness, and surface condition.
My cue *always* plays the same. And when I need a new tip, I install the same brand and shape. So a new tip plays the same as the old.
What is important is NOT the name on the butt of the cue or fancy designs, it is the specifications of the cue, and that you always use the same thing. And the tip which is the "business end" of the cue.
So at a minimum, I would suggest getting a cue within your price range. Find out what brand and hardness of tip it comes with. Find out what tip radius it has (nickel. dime), and stick with that exact same cue forever.
Using the same cue will pay off several years from now.