How do furniture stores work?

I feel stupid because I can't figure anything out on my own, there's nothing on google, and I don't speak the local language in my country so I can't ask for help from a salesperson.

I just tried to buy furniture and curtains for my new house in Japan and miserably failed. There were no product tickets to grab, no system like Ikea's where you write down a code and grab it yourself, and no actual purchasable product on the sales floor. I wanted to ask for help, but salespeople just walk right past me.

I've never had to buy furniture like this before because I've lived in furnished contracted housing.

How do furniture stores work?
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