You should have basically the same engine as me. The hose runs from the water pump, goes down and thenhas an elbo (this is where your line to the heater will be) and runs back up towards the engine. You will have a metal tube, with oil lines going into and out of it. These lines are smaller than the water lines. Follow the water line to wher it connects to this metal tube (transmission oil cooler). Pull the hose and put a finger up their will be a metal screen. This is where weeds or debris would gather. Even if you find no weeds, it is good to check this from time to time as this is where impellar parts will be if your impeler fails or starts to come apart.
As you are facing the back of the boat, this should all be in the lower left hand side of the engine compartment, near the rear. If you remove you that engine panel on that side, you should have easy access. You may need to twist and and torque the hose to get it off the first time.