Oh and how did you mount your transducer
firstly, welcome to kayak fishing and the group here!
there is a wealth of knowledge here and many great posts in the 'rigging' sub-forum of the kayak section. lots of ideas on how to set up a battery box, mount transducer and run wires. you can read through the threads or start your own and see what info shows up
congrats on obtaining a great yak and sweet fish finder, you should have a blast on the water!