Ubiquiti Device Setup Assistance

I need technical assistance with setting up my Ubiquiti device which I'm using to establish a Wi-Fi network. I'm uncertain about the exact type of Ubiquiti device I have so the ideal freelancer for this project would be skilled in all Ubiquiti devices including UniFi Access Point. I want to beam internet to another building on my location . A friend set up the first one for me , I’m able to cable drop , but need help on the tech and set up side . Someone able to help me with the whole project from purchasing to set up .