Before doing anything , purchase" Da Book"!
This is the mait and operating manuals for your specific engine. Usually about $100. or so.
With out Da Book, you are guessing, speculating on what is correct for your particular engine.
Remember the lowest spec is what counts , if it sez to change oil every year or 100 hours of operation , which ever comes FIRST is the time.
Even if only used as a maint guide , eventually the engine will need some love , and whoever you hire to help will love the fact that you have DA Book!