After choosing, you should find the specific address of this newspaper or magazine and put it in their editorial department. As long as it is a thrown manuscript, you can't expect it to return to your hands. In general, they will give you a reply with your manuscript, but they will not return the unpublished manuscript. Therefore, you must have a manuscript before submitting it, and leave more copies when necessary.
Finally, I suggest you invest more, so the chances of publication are higher.
In addition, online submission is also a good way and method.