Since you have no mizzen sheet gear yet it is a great opportunity to design your own. The public libraries are full of books about sailing and I'd recommend a day or two there just browsing to see which book you might want to check out or buy.
The other option is to go to the local marina and find someone with a ketch and ask them to show you their mizzen sheet rig. You'll learn a lot from them.
My ketch had a separate winch on the mizzen
mast that was used to trim the mizzen sheet. Padeye on the aft end of the boom, sheet led down to a block on the traveler, then led to a block on the aft end of the boom then along the boom to a turning block at the forward end of the boom down to a small winch on the
mast with a cleat just below that. You can rig yours however you like.
Once you've mastered the art of sailing I hope you'll fly the mizzen staysail at every opportunity. It is a great sail that folks who own cutters and sloops just never get to use.
kind regards,