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Yes, it’s a 4-stroke and unless something has changed dramatically, you should run SAE30 (non-detergent) in the crankcase.
If the oil fill plug is oriented horizontally, you should add oil until the oil level just rises to the bottom of the threads. If vertical, then add oil until it just begins to run back out.. If you want to be really nice to it (you ought to..) then give it a change – it’s likely never had one.
Many mowers have a drain plug down below, under the deck. Others have the drain up top, near the filler. Some lack it entirely, and in this case, you just flip it over and dump it out.
Oh, it’s a new one.. =) If it has a dipstick, you not only measure it there, but add / refill via the dipstick tube as well.