Using right puntuation after "from now on"

[greenhouse]

Please help me to understand why sentence 1 does not have comma after from now on and sentence 2 has comma after from now on. As I copied these sentences from internet, I don't know which one is correct and why. I am always confused using right punctuation.

1. From now on I am going to say what is on my mind.
2. From now on, I'll try to help you with the work.

 

[tedmc]

Commas are not always a must, but it makes a sentence read better when it is appropriately placed.
It is logical to have a pause after "from now on", so I think Sentence No.2 with the comma, is better.

 

[GoesStation]

If you want to keep the same word order, write either I think sentence no. 2, with the comma, is better, or I think sentence no. 2 with the comma is better.