An outline for your novel will not kill your creativity. The outline will help keep you on track and prevent plot holes and other possible inconsistencies in your story.
True, it does take time away from the actual writing of your novel, but while you are working on it, the plot and characters are moving about in the back of your mind. The outline also creates a timeline for you to follow, something to keep you from getting mixed when things happen, where it happens and to whom it happens.
The type I’m doing is the Beginning, Middle, End. What main things occur in the beginning of the book, who is involved and where do the events take place. The Middle is introducing a couple new characters, adding more conflict and roadblocks to the main character’s progress and foreshadowing a few things for the end and that tie in to the next book. The end is tying things together, and resolving conflicts.
As you work on your outline you will get a good idea of what will work and what won’t in the story you are writing. You ask yourself: does this really need to happen now, later or should I cut it all together? Are all these characters really needed or can I cut back on them? Oh, just because you cut something out, don’t throw it away. Stick it in a file, you might find it useful for something else you’re writing.