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If you don't have a waifu waiting for you back home, you can submit a profile to MAID to match you up. Please fill in the following:
>Hometown
This should be more about what your hometown primarily produces to the Nation's economy.
>Hobbies
When you're not being a soldier, or a laborer/machinist, what do you like to do, even if you won't be paid for it?
>Dreams
What do you wish to personally achieve by the time you're old and surrounded by your great-great-grandchildren?
Otherwise you can write in your osananajimi, make friends with a peers who will put in a good word for their sister (very common), or be forever alone.
pic-related: Younger sisters of Obo Bobozo, Henzo Zoro, and Sokaru Kamu respectively.