Hello,
Yes you need a pump to remove the old oil. They are avaliable through various outlets and retailers. Here is a link to one that the average person would need at home for the job. There might be cheaper ones avaliable if you look, but this is way cheaper than the ones I use so im not sure if a quality one can be much cheaper. And as far as the service its self, run the boat till the oil is warm, then change the filter and suck oil from sump tank. Make sure you run the engine first to get all the oil out(your motor is a dry sump) Let me know if you need anything else.
Thank you - TechScooter
Small Engine Technician
3+ years at a motorcycle and small engine repair shop.