Read and output a string TASM Assembly

Question

What I want to do is to read a string from the keyboard and output that same string. However, using the code below in TASM, I get only gibberish:

UPDATED

DATA SEGMENT PARA PUBLIC 'DATA'
MSG DB 10,0,80 dup(?) ; variable to hold string
DATA ENDS
CODE SEGMENT PARA PUBLIC 'CODE'
START PROC FAR
ASSUME CS:CODE, DS:DATA
PUSH DS
XOR AX, AX
PUSH AX
MOV AX,DATA
MOV DS, AX
MOV AH, 0AH
MOV DX, OFFSET MSG
INT 21H ; read string
MOV AH, 09H
INT 21H ;output string
RET
START ENDP
CODE ENDS
END START

Now I get the chance to enter input but the result is gibberish. Where am I wrong?

Answer 1

Thanks to all comments, I managed to write the program which reads and displays a string:

DATA SEGMENT PARA PUBLIC 'DATA'
MAXLEN DB 20
LEN DB 0
MSG DB 20 DUP(?)
DATA ENDS
CODE SEGMENT PARA PUBLIC 'CODE'
START PROC FAR
ASSUME CS:CODE, DS:DATA
PUSH DS
XOR AX, AX
PUSH AX
MOV AX,DATA
MOV DS, AX
MOV AH, 0AH
MOV DX, OFFSET MAXLEN
INT 21H
MOV DL, 10
MOV AH, 02H
INT 21H ;NEW LINE FEED
MOV AL, LEN
CBW ; EXTEND AL TO AX
MOV SI, AX
MOV MSG+SI, '$'
MOV AH, 09H
MOV DX, OFFSET MSG
INT 21H
RET
START ENDP
CODE ENDS
END START