Q what is the proper way to lead going to quick steps from slow steps?
In your post you describe several combinations of slows and quicks. It will be helpful at this point, to not think in terms of set numbers of quicks and slows, except for some that are very basic.
You don't mention side steps or rock steps, so let's assume you are walking. (Actually, for my money, I'd say rock steps (quick quick (yes, counting) ) are easier to master than "little runs" or corridas).
Start by walking slows to music that you have picked.
The amount of energy that you give to your partner, and the amount of time it takes to do that should be constant, and, very importantly, in time to the music.
Your forward energy should build up in preparation for that your first quick step. As boardertangoman writes, this is the "signal" to your partner that a quick step is coming.
While you are responsible for starting this build up just before your first quick step, your partner is responsible for learning to feel this change.
It is important to understand that there is nonverbal communication going on.
It is also important that your partner does not pull away from you coming towards her with more speed and energy when you begin taking your quick steps, which is the natural reaction.
If she moves away from you, you will feel the two of you being separated, and she will not be able to feel you slowing in preparation for a slow step.
The corrida usually consists of three quick steps, but rather than count steps, when you want the next step to be a slow, you want to decelerate your forward momentum. In other words, slow "gradually", rather than "on a dime".
While you are learning to do this, you will / should do things in an overt fashion. Later, as you both get better, you will be able to become more subtle in your movments.
And, pick something pretty slow to practice to. If you both learn to listen and move to the music as you dance, you will more likely be on the same page with timing, energy, etc.
Always remember, too, that both partners contribute to making things work.