Own Programming Language

If we were to create our own programming language, how would we go about it? I have made this very simple (3 commands) compiler and want to know if it will ever make it out there. I call it a ZT Compiler.

AppTitle "ZT COMPILER"

a$=CommandLine$()
If Left$(a$,5)="-ccas" Then
	filename$=Mid$(a$,7,Len(a$))
	If filename$=""
		End
	EndIf
Else
	End
EndIf

Global started=False

file=OpenFile(filename$)
If file=0
	Error("Could not compile!")
Else
	Repeat
		command$=ReadLine(file)
		If Eof(file)
			Error("DONE!")
		EndIf
		If command$<>"" Then
			If Left$(command$,7)="ADDline" Then
				therest$=Mid$(command$,8,Len(command$))
				If Left$(therest$,2)="[[" Then
					kk$=Mid$(therest$,3,Len(therest$))
					If Right$(kk$,2)="]]"
						txt$=Mid$(kk$,1,Len(kk$)-2)
						Print txt
					Else
						Error("Missing ]]!")
						Exit
					EndIf
				EndIf
			ElseIf Left$(command$,13)="[{ScreenRes}]" Then
				therest$=Mid$(command$,14,Len(command$))
				location=Instr(therest$,"|")
				If location>0
					width=Mid(therest$,1,location)
					height=Mid(therest$,location+1,Len(therest$))
					Graphics width,height,32,2
					started=True
				EndIf
			ElseIf command$="++QUIT"
				If started=True Then
					EndGraphics
					Exit
				ElseIf started=False Then
					Error("ScreenRes hasn't been initialized!")
					Exit
				EndIf
			EndIf
		EndIf
	Forever
CloseFile file
EndIf
End	
				
Function Error(message$)
	api_MessageBox 0,message$,"ERROR",0
End Function

The command line parms are : -ccas filename.zt

The ZT source file:

[{ScreenRes}]800|600

ADDline[[HEY EVERYBODY!!! THIS IS A TEST ON MY VERY]]
ADDline[[NIFTY COMPILER THAT I MADE BY MYSELF!!!]]

++QUIT