How do I add a new option to char_data in structs.h file?

I'm sorry that it seems the only one me keeps asking questions.

When playing games, there are times when you want to start in a specific area as the world grows.
I want to create a new object in a specific room, and when I order it to register, the game starts in that room when I login.

At this time, if the registration cancellation command is entered, the location of the starting room is initialized to mortal_start_room and immort_start_room according to the user's level.

The following is the code I made, but it doesn't run because many places are wrong. It seems to be because I lack basic knowledge of programming.

I added it to the end of the struct char_data in the structs.h file.

I didn't think I should add it to the reset_char function in the db.c file. Or it seems to be initialized with mortal_start_room and immort_start_room according to the user's level.

In the do_stat_character function of the act.wizard.c file, I can get the room name and show it.
This could be solved by knowing how to define and load a new value in char_data.

I think should initialize the starting room for void init_char(struct char_data *ch) function as well.
Again, this is a mess of code.

If the starting room is set in enter_player_game of the interpreter.c file, the character is connected to the room, and if it is not set, I can login to the room according to the level of the character.
ex) mortal_start_room and immort_start_room


I made the utils.h file to get the character's starting room, but it seems to be wrong.
I made a function that initializes the starting room in the limits.c file.
Of course it wasn't made right.

Is it correct to make the following when specifying the following in char_data?start_room is not an int type, it contains the room number.

I want to save and load the location of the starting room just like loading the user's level in utils.h.

In my opinion, it doesn't seem to be called and used as below. Are there any documents that can help you learn this?
The article I wrote was using Google Translator. What I want to say may have been mistranslated into English.

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