I'd like to share with you this snip:

; 
; f.asm - Fill me in for your new procedure!
; Brainstorm 2019 www/snip.codes 
; This is a model large function (proc) skeleton to help you get started
;

.MODEL LARGE
.STACK 100h
.DATA
;variable DB ?
.CODE
; Use .386 if you need to work with variables that take 8 bytes and more. Allows ES,FS etc.
_func PROC FAR    ; Remember that all of your pointers will take place of 4 bytes.
public _func
PUSH BP           ; Save BP's value
MOV BP, SP
;...your function here...
;your returned value should be in DX:AX (if you work with c etc.)
POP BP
RET
_func ENDP
END