I usually do not use more chords than 4 or 5 when creating. I use the chords of a certain Key, for example A major and stay within that key until the piece is done. I may change to a different key, but I will always begin with the intention of staying within one, always keeping the possibility open for change. Remember the power of limits, especially in music.
When you have too many choices it can be overwhelming and will stop you from being able to go forward. That's why learning to play in 4 and 8-bar phrases is important. It gives you the limit of chord changes. New age music is mostly a static music meaning that the chords do not change too much. In fact, you can have the same chord going on for 8, 16 and even 24 bars or more. The amount of change is dictated by personal taste and that you will acquire after you freely experiment with the music.
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