Idea replies — I have a Free POS for restaurants, cafes, bars, clubs

Haven't tested that with anyone but I am thinking to contact some friends who owns restaurants so, that I can start.

That's definitely a good start, I would treat friends more as someone who can give you an insight on everything there is to know about their business, what problems they have and how you can solve them with your product - other than that unless they pay, their opinions may be biased, as in they may say things to protect you or/and make you happy as friends do:)