By start small i mean do 5 push up for first 4-5 days then slowly keep increasing
All the best, and remember you’ve got this. Just take it one day at a time.
It's isn't too easy, yet it isn't too difficult either. In this way, it doesn't create too much of mental resistance before you even start, which is the most difficult part. Make sure to do it in small steps with minor increments weekly.
Don't overthink it, just start. Even if you want to start with 15 reps of pushups, ab crunches and squats a day, just start doing it and make sure it's easy enough that you stick to it daily. The consistency will come.