If I get known of it, I will tell you all everything.
Can I say this, or it sounds akwardly? If it does, how should I say it?

 

It sounds awkward and isn't a common construction. Here's what one could say:

"If I get word of it, I will tell you all everything" (if I hear about something)
"If I find out about it, I will tell you all everything" (if I learn about something)
"If I get to know it, I will tell you all everything" (if I become familiar with something)

 

Many Thanks!