Welcome to the forums,
let's get the nasty bit over first.. Kali is not for those without a competency and experience using the Linux terminal [read the full Kali documentation.. link on their download page]
Wi-fi and Kali are a regular problem for Linux newbies, and usually boils down to lack of suitable drivers in the Kali distribution,
check the status of your WI-Fi, by installing inxi from the software manager, and running [from the terminal] inxi -Nnz, if it says status down, or doesn't show the Wi-Fi card then copy and paste back the results