Verifying assembly x86 code.

Question

Hi, I'm learning win32 x86 assembly with MASM. So far, I've noticed two ways you could write a procedure in MASM. I'm getting the correct output (18). But I'm not sure I'm missing something, There are very few online docs available on how you can write subroutine with "Invoke" directive. If possible could anyone verify if the way I'm writing is correct or not (I know that I should include comments).
.386
.model flat, stdcall
.stack 4096
ExitProcess proto, dwExitcode:dword
.data?
sum dword ?
.code
addNum proc
push ebp
mov ebp, esp
sub esp, 4
mov ebx, 2
mov [ebp - 4], ebx
mov eax, [ebp + 8]
add eax, [ebp + 12]
sub eax, [ebp - 4]
add esp, 4
mov esp, ebp
pop ebp
ret
addNum endp
addNum2 proc numA:dword, numB:dword
sub esp, 8
mov ebx, 3
mov [ebp - 4], ebx
mov ebx, 2
mov [ebp - 8], ebx
mov eax, numA
add eax, numB
sub eax, [ebp - 4]
sub eax, [ebp - 8]
add esp, 8
ret
addNum2 endp
main proc
push 5
push 5
call addNum
invoke addNum2, 15, eax
mov sum, eax
add esp, 8
invoke ExitProcess, sum
main endp
end main

Answer 1

Hello There Mate!
I Prefer You To Post Your Questions On StackOverflow.
Devs Are Highly Active And You Get Your Answer ASAP.
If you Want Ask Questions Here wait for Atleast A Month Or So.