Change the oil and filter. Use whatever oil you like (about to start another endless debate here). I am running synthetic Castrol Syntech 10w-50. Personally any good APA rated oil will be good. The harder you run it, the higher oil temps you run, the heavier you should run and/or consider synthetics. Some folks suck out through the dipstick. I have a drain hose attatched to the drain plug location. It is slow, but I am patient. Probably takes 5 qts unless there is a deeper pan. My Indmar 454 only holds 5.
Change the plugs, I have no preference as to brands. Always check the gap as they can get knocked arround in shipping.
Find out which Berk drive. There is a plate atop the housing inside the boat. At least that will tell you what it WAS if it has been modified. Folks can help you figure out the rest here in the "just jets" section. The drive should be absolutely QUIET. Some noises are harmless (a slight rattle at idle if the impeller is slightly loose on the shaft), some are all kinds of BAD (squeals, grinding, vibrations). Most bad noises shakes come if the thrust bearing in front goes bad. KEEP IT GREASED with a top-grade marine grease and it can live a long time. If it goes completely on you, I have seen it wreck a crankshaft by pushing on it's thrust face which is not designed for that. The rear of the bowl has 2 plugs, GL-5 gear lube (glorious, stinky 90wt). Other things can likely wait till you get to drive it and feel it out for behaviors/quirks/problems.
Welcome to the greatest way to drive a boat.