Nanuk, when I got my first kamado style cooker, I found the biggest challenge was around stabilizing a fire at the desired temp. What you will find, is that in a kamado, fire gains inertia. If you are targeting 225 degrees for a cook, you have to start closing the vents or slowing down the inertia 50 or so degrees below your target. If you wait until you get to 225, you will blow through your target temp and get too hot.
Another aspect of this is the size of the fire. For low and slow, I light one area of the lump. For higher temp cooks, I light multiple spots. If you light too much charcoal, your fire will be too big to maintain lower temps.
Wait time is generally a matter of your personal preference. I pay more attention to this when going low and slow to ensure the grill has stabilized around my target temp. When cooking hot, I only heat soak the grill when I want radiant heat from the dome of the grill (e.g. pizza, chicken).