I use local or nearby support/resistance levels and draw lines above or below them and set that as the price. I also at times use fibonacci retracement points as buying rungs. Stops are usually the bottom most rung.

You can vary it as you want. To me, two rungs are better than just one. So, for quick trades, I use two or three rungs. You can also ladder your ladders which I often do. I don't pour my wallet into a single ladder. Each ladder would get 10% to 30% of wallet. A quick trade less.