Compile and run assembly on macbook

Question

I'm taking a course on computer structure and I'm lost. I was given the following file: Hello.s:

#This is a simple "Hello World!" program
    .section    .rodata #read only data section
str:    .string "Hello World!\n"
    ########
    .text   #the beginnig of the code
.globl  main    #the label "main" is used to state the initial point of this program
    .type   main, @function # the label "main" representing the beginning of a function
main:   # the main function:
    pushq   %rbp        #save the old frame pointer
    movq    %rsp,   %rbp    #create the new frame pointer

    movq    $str,%rdi   #the string is the only paramter passed to the printf function (remember- first parameter goes in %rdi).
    movq    $0,%rax
    call    printf      #calling to printf AFTER we passed its parameters.

    #return from printf:
    movq    $0, %rax    #return value is zero (just like in c - we tell the OS that this program finished seccessfully)
    movq    %rbp, %rsp  #restore the old stack pointer - release all used memory.
    popq    %rbp        #restore old frame pointer (the caller function frame)
    ret         #return to caller function (OS)

I tried the most naive thing, went into the terminal, and wrote:

gcc Hello.s

I got the following messages:

Hello.s:2:19: error: unexpected token in '.section' directive
 .section .rodata #read only data section
                  ^
Hello.s:7:2: error: unknown directive
 .type main, @function # the label "main" representing the beginning of a function
 ^

I'm completely lost and I have no clue what I should do. My professor is of no help, and almost all the other students own a Windows pc and figured it out in different ways.

What am I suppose to do? Is there a program I should download? Anything at all I could do before going and buying a Windows computer?

Please be very specific and easy on your answer since I'm no expert under any means.