Dear Miss Snark,
I wasn't sure if you have already discussed this, but I couldn't find it. I am preparing to query several agents on my fantasy novel which is the first of a seven book series. I wasn't sure if my synopsis should only contain what pertains to my first book or include an overview of the books to come. If it should contain information about the future installments, what percentage of the synopsis is dedicated to the first book? I don't want a long synopsis bogged down with unneeded information.
Also, when the agency wants the first chapter, do I also send the prologue, or only the prologue? (The prologue is the same size as my chapters).
I'm sure this dreadful question is in the Snarkives somewhere but it bears repeating. Even if you're planning to write a seven volume treatise on the politics of Rabbitania, start with book one. Your synopis is short, and it covers book one. You can mention very politely that you envision this as the start of a series. Try to avoid using a number.
Fantasy editors are more forgiving of this kind of thing than other less dragonly editors I'm told, but you have to sell this before you sell it all.
There's nothing wrong with starting at one and working your way up.
And when you're asked for chapters for dog's sake don't send the damn prologue. Send chapter one.