Have you stayed in Hostel's before? if not, I'd recommend you check out your competitors, or others online.
I imagine hostel's vary country by country, so what might work in the states, might not fully apply to a different geographic region. One thing I can say, is most guests who stay in hostel's are looking to save a few bucks, and you the hostel owner, is always looking for positive reviews. With that said, I would focus on affordable low cost amenities such as supplying the house with cheap items such as rice, milk, cereal, peanut butter, jelly, bread, or other items that may be affordable in the region. Follow standard checklists what hostel guests look for, and see what you can afford. Beyond standard requirements such as cleanliness, I find hostel guests appreciate locker access. Having to share spaces with others (and not having a lock) can cause concerns for other guests, but if you provide a locker, this should alleviate concerns. I would recommend you purchase a lock where you can change the combination, this way you don't have to worry about lost keys, or previous guests knowing locker combinations.