I like to think that I'm pretty good at making this sort of coffee, and I have learnt a few tricks that make it really the best.
1. Read any/all of the instructions that come with the pot. I'm pretty sure that my current pot didn't come with any, but if there is then it's best if you follow it rather than guess.
2. Keep everything hot. Pour a little boiling water into each mug that you're going to use. (Don't use tea cups- they'll cool down too quickly)This warms the cup so when hot liquid is poured in it won't cool as much. Oh, and don't waste time pouring the coffee.
3. Learn you proportions properly. The 'ideal' cup of coffee varies from person to person so the exact amount of water and coffee in the pot is subjective to preferences. Generally, fill the water up fully (There may be a mark, bolt or some indicator) and add the coffee to your liking. If water fills the metal coffee holding part (I don't know if there are real names for each of the parts. There may be...) then there's too much water. For more people, you'll need more coffee.
Also it's good to establish the proper amount of milk for each person. Again this is largely a personal opinion, but I find that half a cup of milk is good for one person coupled with half a cup of strong coffee. Milky AND strong!
4. Take it slow. Keep the gas on a cool as possible. The coffee will take considerably longer to be ready but there's less chance of it burning and the coffee grains will have had more time to infuse. By the way, when you hear that whisteling sound, turn off the gas. That is the sound of air, not coffee, running through the pot and greatly affects the flavour (it can even burn) and almost no more coffee will run through.
5. Understand the temperatures and times. I've breifly mentioned this earlier, but you want the coffee to be as hot as possible. It's easy to let a cup of coffee cool to the right temperature, but it won't heat up at all. I find that on my microwave, 1 minute per half cup of milk in a microwave safe glass jug (enough for one person) works well to get good, steaming hot milk, but it depends on the sort of microwave. Also, keep the hot freshly brewed coffee in the coffee pot. The metal of the pot will stay nice and hot and keep the coffee hot.
6. Whisk the milk. I've seen fancy milk whiskers that are battery operated, but I find that a good whisk is far more effective.
You would have noticed that I've been repeating myselfa lot, saying 'It's mainly personal taste'. It's true that for this sort of coffee making there are no exact formulas or recipes to work from. Instead, just spend time experimenting to work out the best proportions, don't burn yourself, and enjoy.