On the left side of the engine towards the front is the drain plug, on the drain bolt is a sealing washer, it is a good idea to replace this washer ever time the plug is removed.
The oil filter is on the back of the engine. wipe a light coating of oil on the seal before installation of the new filter and it is installed hand tight (snug).
Honda sells HP4, that is a good synthetic oil to use.
When refilling, be sure to check you oil level with the bike standing straight up.