The biggest thing you will need to do with the engine is to bleed the air out if you run out of fuel. If there is air in the fuel system, the motor will not start no matter how much you try. You will kill the batteries. Bleed it and it will fire right up. At the front of the engine on the left side as you look at it, there is a gray metal fuel jar. On the top of it is a bolt. Look aft and you will see a little lever, that’s the manual fuel pump lever. Crack the bolt open a bit and pump that lever til fuel comes out of the bolthead with no bubbles. Tighten the bolthead up while pumping the lever. Then follow the fuel lines up toward the top of the engine. There is a little bolt with a Phillips head where the lines split into 3 metal lines. Use the big screwdriver to crack that open and pump the lever again til there is a little fuel that runs out by the screwhead then tighten. Now start the engine. Crack that screwhead a bit after the motor is running to get any last bit of air out so the motor runs smoothly.
You also check the oil on the same side as you bleed the fuel line (the starboard side next to the sink). You will see the dipstick and it is self explanatory. Getting the oil out to change it requires starting the motor to warm the oil (it must be very warm/almost hot), putting the pump dipstick tube in the dipstick hole and suck out the oil. About a gallon. The oil filter is on the port side.There are spares behind the back of the port settee with the tools and spare parts.
The transmission oil check is on the transmission housing behind the motor. It is a yellow cap.Check the manual but I believe oil comes to the bottom of the dipstick, it is hard to check because the oil is very clean. It uses the same oil as the engine, Rotella-T 15w-40. No need to change it, just make sure it is at the proper level.
The Nigel Calder manual will spell out aything that you need to fix/investigate and there are all the supplies and tools you should need.