how to publicize my posts ??

Hey guys so before i was using the free wordpress.com and they had an easy to use publicize section. Which allowed me to share to facebook and twitter.

Now i got my own hosting and domain. I still use wordpress but now i have to look for plugins to make things work. Im trying to find a way to publicize my posts. That way if i write something it will be automatically updated to facebook and twitter.

Do you guys know of any good ones ?

Also if you like to see how my site looks its kzkomputers.com

thanks.