I stay here a week since today.
I stay here a week from today.
I stay here for a week from today.
I will stay here for a week, starting tomorrow.
I have stayed here since yesterday.
I have stayed here from yesterday.
Please correct and guide.
Thanks.
I will stay here a week from today.
I will stay here a week, starting tomorrow.
I have stayed here since yesterday.
The others aren’t correct.