Writing and saving patterns

Hello everyone, thankyou for reading this.

I am trying to write a console app that will map out characters and save them to a file for loading later - like a drawing book.
eg.

On the console it displays a grid:

|1|2|3|4
|2|4|6|8|
|3|6|9|12|
|4|8|12|16

like ^ that or something, then the user can enter a a series of numbers according to the grid and it will replace the number they entered on the grid with a '*' so it will make a pattern.the grid will be much bigger, but after you enter the stars you can save the drawing to a text file and keep the stars in the same pattern. But the grid shouldnt remain it should just be there for a reference for where to draw on.

I am just requesting some initial advice or something to get me started. I have tried to do this myself and i am wondering the best way to approach this.

Thankyou very much and I felt I articulated myself quite poorly there, so please ask me any questions if you do not understand. Sorry to be so fussy
Thanks again :)
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