Connect Boot and Kernel file

Question

I started creating my first OS recently (I'm a complete beginner). I wanted to know how to connect the boot file with the kernel. I tried alone but I couldn't, how can I do?

This is the project:

boot.asm

ORG 0x7C00
BITS 16

start:

    mov si, msg_boot
    call Print
    
    jmp $

%include "lib/print.asm"

msg_boot: db "Test Boot" , 0

times 510 - ($- $$) db 0
dw 0xAA55

kernel.asm

BITS 16

start:

    mov si, msg_kernel
    call Print
    
    jmp $

%include "lib/print.asm"

msg_kernel: db "Test Kernel" , 0

times 510 - ($- $$) db 0
dw 0xAA55

nasm -f bin -o boot.bin boot.asm

nasm -f bin -o kernel.bin kernel.asm

type boot.bin, kernel.bin > os.bin

qemu-system-x86_64 os.bin

When I start qemu it said: "Boot failed"