I have lots of tips on my coffee website - www.bestcoffeenews.com !

Use good quality coffee, freshly roasted and freshly ground
Use fresh, clean, cold water. Filtered or bottled water works well, but avoid distilled or softened water.
The grind chosen must be of the correct fineness for the chosen brewing method.
The pot should be cleaned and warm.
Make only enough coffee for your immediate needs. The coffee will deteriorate if you keep it too long. Avoid reheating coffee, it just doesn't taste the same.
Avoid boiling brewed coffee - it is a sure way to spoil the coffee.
Use approximately 70 grams of coffee per litre of water.