Check hull inside often for traces of water, do not flip it over, be careful with it and change oil at regular intervals. Your manual has a pre-ride checklist You can get the manual on the sea doo website.
And don't beach it! Buy a nice anchor and make sure it stays away from rocks and sand. For anchor a good rule of thumb is to buy non floating rope and have the rope at least 20 feet (twice the length of your ski). In my case, I have half rope and half chain. This will keep your hull and impeller sand free. And if you ride in sea water, wash it after every usage (plenty of documentation on that).
To not even start the ski unless you have three feet of water (up to your waist).