YOU SAID:

I'm going to speak like this from now on

INTO JAPANESE

これからこう話します

BACK INTO ENGLISH

I will talk like this from now on

INTO JAPANESE

これからこんな話をします

BACK INTO ENGLISH

I will talk about this from now on

INTO JAPANESE

これについてはこれからお話します

BACK INTO ENGLISH

I will talk about this from now on