Beginner Lake Trout Questions

Fishing Derby tomorrow.
They dumped a truckload of hatchery trout into our local 1/4 - 1/2 acre pond
a few days ago.
Got a pole. A reel. Some line. Some green glittery floating smelly
PowerBait.
Put a small sliding egg sinker above a barrel swivel. Attached a couple of
feet of invisible leader with a single #12 hook.
I plan on having my son fish off the bottom.
Sound like a good rig and a good plan?

Next question. I have a ski boat. I don't know how fast I'm going when I'm
at a no wake speed. How fast is too fast for trolling?

Next question: What's the best way to rig a KastMaster for surface trolling?
Line to KastMaster? Line to barrel swivel to KastMaster? Line to snap to
KastMaster?

Next question: If the surface temp is too warm for trout, how do I get the
lure to run at a desired depth?

Like I said: beginner knowledge base and experience.