Wooden River Boat Propellers How Do You Float Down The Flint River Safetly With A Raft That We Made.?

How do you float down the flint river safetly with a raft that we made.? - wooden river boat propellers

The raft was made of wood and its roughly 4X4 "
Me and my friend (both 15) are placed in the river and swim as far as possible.

What should we do?

What should we do?

And how can we stop the boat if we are to stop us. = D