To sell to people or to give people my software how can i make it so there is just one install button by its self and customer just clicks that install and installs the program?

Right now if i were to give someone freeware i would give them the whole publish folder. Whell whats in it. This makes the qaulity of my programs look bad. I tried just giving the install by its self and it said it cannot install due to missing files or somewhat like that.

I want one icon that when clicked will install my software.
A person can download this ONE .exe from my website.