@Ellie0
No one on this forum could say for sure who an opeation like that would attract since we don't know where you are, what the competition is, or what the demographics of tourists in your part of the world is like. You need to do your research! Start small with renting bunk beds on airbnb or something out of a room in your home and see what it brings in.
The first part of any business is to write out a business plan. Figure out what demographic you would target and see if your small town attracts enough of that demographic to support such an operation.
It sounds like you are seriously considering sinking a bunch of money into starting your own hostel, but I would encourage you to start off with an Airbnb listing from a room in your home first to see if you really enjoy it, see what the guests are like in your town, experiment with the price structure you're toying with, get a better idea of what it costs to clean and upkeep a property, etc. There are licenses, inspections, legalities, and building codes for opening a hotel. Figure in marketing costs, listing fees, insurance, accounting, utilities, supplies, linens, legal, loans, and make allowances for seasonal and market slow downs.
Please be careful. Low budget can be great for young and idealistic world travelers, espeically in cities that are attractive to that demographic. Low budget can also be great for drug dealers, the unemployed, etc. You could find yourself with a big mess on your hands if you don't take your time and sort all this out before taking steps.