I am thinking of writing a trilogy and was wondering how should I begin. Should I plan out to write three books or just see if the story develops into more than one book? Thanks!
I had an English teacher who was planning on writing a book and he told us that when he took his work in to get published, he found out that it's really up to the publisher if you have a series or not (usually) But he was just saying that it's better to focus on writing one book at a time, and then consider the rest later
I'd start with a three act structure for one book. If you can split each act into three sub-acts - giving you three books that will stand on their own, each with a resolution, and a story arc for the trilogy - you're there. If the sub acts idea doesn't work, you have one big book.
It's not a hard and fast rule, or course - breaking the three act structure might be what sets you apart from the crowd (though this is kind of double-edged and not always a good thing).
If first book looks good and the story looks like developing into more than one book, the question comes up - why stop at three?