go to the walkthrough on gamespot.com. they make it pretty simple
there are no floors in the ocean realm.i think your confusing the ocean realm with the ocean temple.
beat the the dark temple floor
you must head to the temple of the ocean king for some reason
This will answer evrything for you: http://www.zeldadungeon.net/Zelda13-spirit-tracks-walkthrough-06.php
No he is not in the temple but after you beat Lake Bed temple he is in a cut scene after you beat the temple so WATCH CAREFULLY.
I think you have to get to the marine temple, then on one of the floors there is an enemy with the whip, you have to beat him, then a treasure chest appears with the whip, to beat him you have to let him get you with the whip, then when he starts dragging him to you turn around so you're facing him, then attack him.
you have to beat the fire temple.
you need to be more spacific what do you mean the first part the end sub mit your answer when your more spacific.
After beating lakebed temple, you will have to beat the temple in the desert. Though it isn't the end just yet.
Go to Zauz's island in the Northwestern sea on the top middle then get the southeastern sea chart in the temple of the ocean king . Then goron island and defeat the temple.
you have to try your best good luck, it was easy for me anyway, if your stuck just go on youtube, it will show you.
beat argorok